Basic guide for the Buzzy route, it mainly details fight and items, for navigating around puzzles and traps you should check Dalia's guide or watch one of the run.
Trainers won't always send their mon in the same order, you need to be vigilant when following the guide to use the correct attack against the correct mon.

The first 8 fights with Buzzy can all lead to unavoidable deaths if the opponent use the correct combination of move, do not hesitate to reload an auto-save if Buzzy dies.
Except for the Dark Lumon, do not use Patter or Cubzero, Buzzy needs all the XP it can get.

Start the game, run from the first battle, go to the Receptionist, select Easy Difficulty/shorter course Take Cubzero

Nelson
= Toruga
=> Scratch until dead

Go see Rigel in Lab, skip through dialogues

Capture Mino: try to get through the grass as fast as possible, if you didn't see any Mino in grass, search for it in the wheat field, it has an higher chance to appear there.
Trade the Mino for a gullible Buzzy (you can reload the auto-save until you get the correct trait, no need to check potential, it is always 15).

First Beezle => Heal if enemy is faster and you are in death range (without Rage, it deals between 9 and 12 damage with Slam)
=> Rage
=> Slam till dead
(You can die if the opponent is faster and start with Rage=>Slam/Slam, you may even get OHKOed if it is gullible and starts with Rage=>Slam)

Grab fruits in eastern house
Go in library, grab stinky scent, talk to NPC to get the books
Take the Beezle Quest in the Coromon Center

Shop at vending machine
= 4 SHP cakes
= 5 SSP cakes
= 2 iced
= 2 detox (3 if already poisoned)
= 4 ground

Heal poison if needed, give Ber fruit, activate stinky scent

Shiny Beezle
=> Rage
=> Slam until dead

Go through the forest, avoid spinner (Jodie: (heal poison) Rage+Slam/Slam) and runner. Most of the time you can avoid the runner but sometimes he will look directly up and see you, this is completely random but quite rare.

Take Ber fruit in chest

Donar Island:
Get into the Coromon Center and grab:
= hidden enhancer gem (2nd Floor, central cabinet at the top)
= Mon Storage (1st floor, in golden chest)

Go to the lab, skip through dialogues Heal poison and equip Enhancer Gem while in lab (this way you won't have to re-do the menu if you die to Owain)

Go into cave, grab Ber fruit in chest, avoid walker

Owain
= Sanscale
=> Rage to at least +2
=> Slam till dead + heal if hp <= 14
= Sanscale
=> Slam till dead (if you hit Jodie, you should be lvl14 here so use DS instead)

=== Heal SP only if you missed a lot of attacks against Owain ===

Lowri
= Fiddly
=> Rage + DS * 2 (S cake if you have < 22 HP after raging) (or DS + Slam if Fiddly has less than 15HP and didn't up its defense)
=> if fiddly has humidifier (20%), it is almost a guaranteed loss (may be worth to try DSx2?)
= Houndos => if you didn't get extra XP, you should lvlup with the Fiddly so no need to heal, but if you are low on health you should heal, houndos is quicker and can deal around 10 damage.
=> DS + Slam (if needed)

Fuzebox
=> Rage
=> DS+Slam (you want to die to heal the para)

==== HEAL SP ====

Dark Lumon => If Bright Light, swap immediately
=> DS till dead
=> swap if he applies -atk
=> If he does distortion twice, he needs to heal SP on the 3rd turn so you can go for DS and hope to get the kill

Grab Rubber Duck in chest
=> HEAL HP + SP to full + equip Rubber Duck

Go into Power Tower

Floor 1:
Lever: C L E A

Michael
= Patterbit => can kill you with feeler + propeller punch or propeller punchx2 with overclocker
=> Rage
=> DS (+ Slam if needed)
= Lampyre 16 => may need to heal (it is quicker than Buzzy)
=> DS
=> Slam if needed

Lever O
Take Ber fruit hidden left of lever

Solana
= Toruga
=> Rage + Slam
= Patterbit
=> Slam (or DS if you are still lvl 18)
= Taddle
=> Slam
=> Can die if Toruga decreases defence, Patter has Overclocker and it uses Propeller Punch

=== Heal Status if needed ===

Floor 2:
Lever F I C I F Go South, C level again

Tisha ==== do not learn attack at 20 but Disable Venomous Bees ===
= Patterbit
=> Rage
=> DS (or Slam if crit is ready)
= Moobie
=> Slam

Lever G C
Avoid spinner (Diane: DS + Slam if needed, if menacing you may need to Rage before attacking)
Lever E J A O A H K J A

Henry => DS*3
= Mino
= Frova
= Lumon

Lever L O

==== Heal SP to full

Floor 3:

Ferne => beware, both mon can decrease SP, needs max SP before going in
= Bazzer
=> Rage
=> DS
=> DS or Slam depending on remaining life
= Otogy
=> DSx2

Floor 4:
Do mastermind

Floor 5:
Take XP Chip hidden in right cupboard after elevator

Lever H (Left part of the level)

=== SP CAKE, heal para, equip Ber fruit, XP CHIP===

Jefferey
=> Rage
=> DS
=> DS for the second mon (if Sheartooth may need 2)
=> Learn Sting and use it for the third mon
=> Cancel Evolution !

Lever H again, then O F

Go on the right part of the level

Lever G, avoid spinner (Leslie: Rage + Slam*4)

Lever E G

=> Take Golden chest next to may
=== Equip Ber fruit ! ===

May
= Gildwing
=> Sting
= Bazzer
=> DS
=> Don't learn feelers

Lever F

=== Heal para, MSP + BER ===

Floor 6:
Take lvl cake (hidden in the 3 pipes left of elevator)

Voltgar => you can't act every 4th turn when paralysed, try to time it so that it doesn't happen when you need 1 last attack because Voltgar is buffed and can OHKO (you can tempo with a heal)
=> Rage * 3
=> DS * 2
=> Slam
=> don't learn magic drain

Go back in the elevator to get the call from Rigel

Fully heal Buzzy, equip Rubber Duck, LuxRecall.
TP back to Donar Island and talk to Rigel in Lab

Go to the shop,
Sell : All Phoenix Stones, all Fruits
Buy :
= 3x HP Cake (M)
= 5x SP Cake (M)
= 2x Iced Cake
= 4x Spicy Cake
= 2x Clear Cake
= 2x Ground Cake
= 2x Detox Cake
= 4x Cafi Cake
= 11x Stinky Scent (Only 10 needed, one for safety)
= 7x LuxRecall (Only 6 needed, one for safety)

Talk to Derrick and take the boat.

Assign Stinky Scent to quick menu and use it before going into the grass.

!!!!!You need to harvest 3 red mushrooms (sweatshroom) in the swamp!!!!
If you see a mushroom close to hatching, you can wait to grab it (it takes ~8s per stage).
After fighting a trainer, you can go back a little to see if some shrooms are close to hatching

Shirley
= Gildwing
=> Sting
= Bittybolt
=> DS
= Mino
=> Sting

Go right, take left bridge,
Avoid Spinner (Myers: Sting)
Go into passage north hidden in the trees

Get the call from Velma
====== Take XP Chip hidden in the rock on water on the western island ====

Alan (taddle/taddle/fido)
=> Sting on fido, Slam on taddle
=>Do not learn precision eyes

Go east, pass the bridge south, continue east then north into the next zone (there is a small island east where you can find Sweetshrooms if you still haven't found any, check it).

Tammy
= Wolf
=> Sting
= Acie
=> DS
= Tadle
=> Slam (or Sting if wolf was menacing)

=> go right, avoid spinner (only 1 tile vision) (Sage: Rage, Sting*3)

Three spots for red shrooms between Sage and Ryan, if nothing is close to sprout, fight him and check back after (champs grow during fights).

Ryan
= Taddle * 2 => Slam
= Patter => Slam
= Lampyre => DS

Take the raft to Pawburry

Grab the Skill flash in the NW corner of the Coromon Center (Distract)

Go into the manor,
do the teleportation Puzzle : E N N E S W N
Grab the Messer stone,
Grab the lvl cake (glass case in puzzle room)
Go into monastery (no need to talk with the guy before the door)
Grab the XP Chip (Hidden behind the statue in front of the monastery)

Heal SP (if low) + Stinky Scent

Matthew
=> Sting *3 (or 4 if well rested)
(no need to rage even if enemy is menacing)

Magdalena
=> Rage + Sting (no need to Rage if crit for second mon (crit==27 when attacking the first one))
=> Sting

Take the central door

Equip Enhancer gem, heal SP

Simon
=> Sting * 4 (may need more depending on opponent traits, if some mon is menacing you can Rage once)

Bartholomew
=> Rage + Sting * 4 if no dark atmosphere on first mon
Or
=> Sting * 5
=>do not learn Transcending

Do the souls Mini Game

== heal status if necessary, SP heal if low on SP (<~16)

Illuginn
=> Rage * 3
=> Sting until dead => heal if HP <~40/50

Grab the XP chip on your way out if you forgot to do it when going into the monastery

Go into the desert

=== HEAL SP if less than 16 === (no need to heal status)

=== use Stinky ===

Patricia
= Blizzburd
=> Slam if not drowsy, else Sting
= Aroa
=> Sting
= Krio
=> Sting (or Sting+Slam if well rested)

Get through the Hot Desert

=> North then west
=> West
=> West then North
=> Bridge
=> ===Take the Hidden Level Cake===
=> East (beware of spinner, stay in South west corner of the tent)
=> North

Go through the cave
After the cutscene, capture the Dark Lumon with the magic spinner
Go west through the bushes
Enter Darude, go into the quest house (leftmost house near the market)
Go NE of town, do the infiltration mini-game

Go in the palace, grab the All In skill (chest on a table in small room NE of entrance)
Then go top and left, reach the prison, Mahmud is in front of the first cell, you need to pass in front of him to get the dialogue
Then go to the right of the palace until the cutscene triggers
In the the prison: sleep twice, eat apple (bottom of 6th tab in inventory), sleep, talk to guard
Go to the guard to the left of the prison, avoid the walker

=======
Replace Rage and Slam with Transcending and All In
Get 3 level with rare candies
M SP Cake
Equip rubber
XP CHIP

Guard 1
= Tinshel
=> DS
= Dunpod
=> DS
= Sandrill
=> Transcending

Guard 2
= Slitherpin
=> Sting
= Fibio
=> Sting
= Centilla
=> Trancending

Guard 3
= Skuldra
=> Trancending
Magmillus
=> Sting (x2 if needed)
=> Remember that you have more points than usual to distribute when gaining potential level here

Avoid the walker

=== SP HEAL ===

Guard Captain : needs 38 SP!
= Ghinx
=> All In + Sting
= Bittybolt
=> Sting
= Kyraptor
=> Transcending
= Molteye
=> Sting
= Krypeek
=> Sting
= Shimshell
=> Sting

Go into the Pyramid
Use Stinky

Seif
= Arcta
=> Sting
= Gynx
=> Sting
= Ruptius
=> Sting
= Byttibolt
=> DS

=== MSP Cake + equip Enhancer Gem

Tia
= Flowfish
=> All In + Sting
= Armadon
=> Sting
= Hountrion
=> DS

Sart
=> All In + Transcending (if you are hazy, DSx2 instead)
=> DSx2 (kill Caradune first) (If you are Hazy, sleep to restore SP before killing the 2nd mon)
=> Transcending + DS (or DSx2 if the first transcending was a crit)
!!!!! You want to end this fight with the para counter on Sting on 3, replace the DS against the 2 adds with Sting if you need to increase the counter.
When the combat ends, the skill should look like that:
(Notice that the green bar is higher than the 2 blue bars, meaning the next hit with Sting will paralyse the opponent).

Don't heal (You will be healed before the fight with the cube)

=> If para on Sting is available for the next hit
Store Cubzero and Patter with the Coromon Storage (6th tab of the inventory)
Unlearn Transcending
LuxRecall back to Lux Solis

Mirror Cube
=> Sting + Para, Sting.
=> If you messed up and para is not available, do this instead: (Or just YOLO Transcending if late)
=> Swap to Cubzerro, die to transcending, send back Buzzy and use Transcending yourself. If opponent doesn't use Transcending on Cubzerro, swap to Patter, hope for Transcending, send in Buzzy and Transcending, if still no Transcending on Patter, use Transcending and hope you don't die

After the dialog with Rigel, relearn Transcending, Heal Buzzy if needed (no need to be full HP but don't be too low), Luxrecall and TP back to Darude

Use stinky, change module to push
Enter grotto, go right (do not fight the trainers in the first room)

Lars
= Fibio
=> Sting (then heal poison if needed)
= Sheartooth
=> Sting (x2 if well rested)
= Aroara
=> Transcending (Sting if crit available)

Get on the island after Lars

Fanto
= Dark Centilla
=> All In Sting x2 (or Transcending if crit available)
=> Dark Centilla
=> All In Sting x2 (or Transcending if crit available)
(You can die on this fight if the first Centilla do very high damage with magnitude, if you are on a good pace you may want to save right before triggering the fight)

==== HP Cake (M) if less than ~50HP ====

Right into water, UP until the change of map

Dodge the runner on the big island, then right into fight

Violet
= Blazitaur
=> Sting (x2 if needed)
= Terravolt
=> Transcending

Do not heal status

Trigger cutscene in Vlamma and Push boulder thrice

Hannah
= Purrgy
=> If Kindred Soul++ (40%) => All In, Sting
=> If no passive => Sting

Do the 22 jumps trial, then use LuxRecall and TP back to Vlamma for the Swurmy Rush.

Shop:
= 5x HP Cake (L)
= 5x SP Cake (L)
= 1x Combi Cake (L)
= 1x Atk+Heal Cake
= 3x Def+Heal Cake
= 1x Atk Cake(L)
= 6x Defense Cake (L)
= 1x SpeDef Cake(L)
= 2x Hot Spinner
= 1x Protein Scent
= 1x Devolve Pill

====Take the POMO hidden in the bush in the Center where you do the Swarmy rush====

Exit the Coromon Center, go back to the old man, paint his fence, go inside and get the light spinners
Use the Protein Scent and catch 1 Hountrion, 1 Blazitaur and any other Coromon for the fight trial.

Light Sensei
= Atlantern
=> swap to Hountrion if needed => Multi Bolt x2
= Arcturos
=> swap to Blazitaur if needed => Fire Horn
= Ruptius
=> if Blazitaur => Berzerk
=> if any other mon, use whatever until death

LuxRecall and go back to Vlamma, trigger cutscene north of town

DO NOT USE STINKY

Capture Bloby or Molteye and devolve it to Bloby (I still haven't tested that devolving works for the trade, if it doesn't please share :) )
Deposit the Bloby with the remote computer (tab 6)
XP CHIP + STINKY and go to 2nd floor (left scale)

You will reach Max Atk on this fight or the next, increase HP from now on

Raja
=> Sheartooth => Sting (x2 if well rested)
=> Embeaval => Transcending

Take the 2 wagons. Take the 3rd wagon, avoid Vinaya.
Go downstair. Take the first wagon you see.

Jesse
=> Articram => All in + Sting
=> Hountrion => DS
=> Grimmask => Sting

Take the wagon on the way, activate the switch and take the wagon again.
Avoid Runner (else, transcending).
Activate the 1st and 2nd switch, take the wagon.
Take the first wagon, activate the switch and take the wagon again.
Activate the switch, take the 3rd wagon.
Activate both switchs, take the wagon again. Go downstair.

Connor
=> Eclyptor => All In + Sting (If no Dark Atmosphere, else Sting till dead and All In on next mon) => Magnamire => DS
=> Arcturos => Sting

Take the wagon.
Activate the 1st and 3rd switch.
Take the next wagon.

Jesse
=> Grimmask => All in + Sting
=> Hountrion => DS

Activate the switch, go back twice.
Activate the switch, take the same wagon.

Go right, fight Prudence

Prudence
=> Toruga => All In + Sting
=> Embeaval => Sting
=> Volcadon => Sting

Take the wagon, activate the switch and take the wagon again.
Activate the switch, take the wagon. Take the 2nd wagon, activate the switch and go back.
Take the last wagon.

Take the XP Chip hidden in the crate above the ladder

FULL HEAL HP but no SP (need >= 20), he will deplete it which take longer if it is full

Go downstairs.

Hozai
=> L SpeDef
=> L Def (it is dangerous but it can be omitted if you are already late)
=> All in
=> Transcending
=> Sting or HP Cake L if life is low
=> Transcending (not needed if first one was a crit or if you used Sting the previous turn)
=> Combi Cake (L) (or sleep if already full life)
=> Transcending
=> Sting if needed

Fully heal Buzzy + Stinky

Go east, take cable car to Friesa pass
First Stair, then left

Aeron
=> Blizzian => All In + Sting
=> Arcturos => Sting
=> Krybeest => Sting

North, east, stairs up, stairs down, stairs down, east, stairs up

Vigdis
=> Megalobyte => Sting (x2 if Well Rested)

Go west until stairs, take stairs up then full east

Hiram
=> All in => Sting * 4 (unfreeze when needed)

Fall into the water, wake up, go south cross the lake, activate the cutscene SE

Talk to the kid
Take the Cook quest and validate immediately (shrooms)
Return north, take the quest from the seamstress

LuxRecall, walk to Haytown (avoid spinner, Chuck: Sting) and take a Carrot

Fully heal Buzzy, equip Pomo, LuxRecall, return to Alavi, go see the shopkeeper, retrieve Bloby using the Coromon Storage and give it to the shopkeeper

Give the carrot to the kid

===== BE SURE THAT POMO IS EQUIPPED =====
Next fight is rippy, you may want to save here

Talk to the woman east of the campfire to activate the cutscene

Dark Arkturo (be cautious, you may need to heal during this fight)
=> Transcending on the Arkturo
=> Artca1 => Sting (may kill if crit)
=> Arcta2 => Transcending
=> Arcta1 => Sting if needed

=== HEAL + Enhancer Gem + STINKY ===

Thomas => remember he can use his mon in any order after Centilla
= Dark Centilla
=> All In * 2, Sting (if you are low on life, you may do All In, Transcending and hope to heal on lvl up, you may either choose to do the 2nd All In on an other mon, or use Transcending on Dark Millidont + Transcending + Sting on Dark Ucaclaw)
= Dark Ucaclaw
=> Transcending
= Dark Arcturos
=> Sting
= Dark Millidont
=> Sting
= Dark Lumasect
=> Sting

!!Replace DS with Feeler
!!Need 26SP, heal if needed
use XP Chip

Vørst => Splash deals damage=Buzzy's lvl, heal if life <= lvl if you can't kill next turn
=> L def cake
=> All in
=> Feeler + Transcending
=> Heal with HP+Def cake or LDef if no need to heal
=> L Atk Cake if frozen (you can also All In if not frozen anymore)
=> Feeler + Transcending

Take LVL Cake in center of arena
Exit cave with scale, go north to trigger the dialogue
Heal SP, LuxRecalls, return to Alavi

Cutscene with Rigel, go West past bald man, go east past Larry, go into grotto

Pass all the puzzles

Milidont + Otogi (Otogi may commit suicide, do not focus it)
=> L def
=> All in
=> Milidont => Transcending + Sting
=> (Transcending Otogi if not dead)

Ucaclaw + Lumasect (Ucaclaw hit like a brick, do not hesitate to heal if HP < ~80, if you need to heal, use the last HP+def cake)
=> HP+def cake or L def cake if already full or close to full
=> All in
=> Lumasect => Transcending
=> Ucaclaw => Sting + Transcending

Pass the remaining puzzles and trigger the cutscene

===== Replace Sting with Distract, use the 3 lvl cakes, fully heal SP and HP =====

Chalchiu => Heal as needed (be wary of Splash), do not hesitate to use the Atk+HP cake if you haven't attacked yet (it saves a turn of combat)
!!!!!Do not try to heal if you are under the effect of Heal Block it makes you waste a turn !!!!!
=> L def (can be omitted if you need to save time)
=> Disctract * 2 (only 1 if you want to save a turn)
=> All in
=> Feelers+Transcending
=> Feelers+Transcending
=> Wait a turn (Heal if not healblock, distract...)
=> Transcending

Split when the screen turns back to black after the white flash