Credits to Gunnermaniac for making a better Route and creating this Guide. Link Below

This is more like a write-up of the fights and crucial steps for the Route. If you want to see a more detailed Guide with Moon Manip: https://pastebin.com/h5LBCkfi

I also reccomend watching the current WR run:

There Are 3 Fights you really want to save for if you are not going for a crazy good time: Shorts Guy; Bridge Rival (100% worst fight) and Lorelei

Rat

• Get Squirtel
• Kill 1 Encounter
• Buy: 3 Balls & 4 Antidotes (Safe Strat: Buy 4 balls and 3 Antidotes, and pick up the Antidote in the forest)
• Pick up Tree Potion
• Manip Rattata:   Brock
• Pick up Forest potion
• BC: Tailwhip x 2, Tackle Spam
• Switch Rattata to front
• Brock: Swap Pokemon, Bubble; Repeat   ROUTE 3
• Change options to Set
• Buy 11 Potions
• Bug Catcher:     > Tail Whip + QA x3     > QA x4     > Tail Whip x2 + QA x2
• Heal to full
• Shorts Guy: Spam QA
• Bug Catcher: QA Spam, finish off with Tackle
• Bug Catcher:     > Tail Whip + QA x2     > QA x5
• Catch Flyer
• Center   MT MOON
• Super Nerd:     > QA x4     > Tail Whip -> swap QA with TW-> QA x2
• Teach Water Gun (4 down)
• Hiker: WG x3 -> teach Fang over Tackle
• Rocket: (Fang + QA) x 2
• Super Nerd:     > Fang x2     > Fang + QA     > Fang x2   Nugget Bridge
• Get Rare Candy and heal to full HP
• Bridge Rival:     > Fang x2 + QA     > Fang (Heal on Abra as necessary)       > Fang + QA     > Fang x2.
• Center; Rare Candy x2 (3 down); get IT
• Bug Catcher: Fang x 2
• Lass:     > Fang     > Fang + QA
• Youngster: QA x2 ; Fang x 2
• Lass: Fang; QA x2
• Jr. Trainer: Fang
• Rocket: Fang x2

MISTY

• Hiker: Watergun
• Lass: Fang x 2
• Hiker: Watergun x3; Fang the Machop
• Lass: Fang x 2 ; QA x 2
• Bill -> Escape Rope (3 down) -> Center -> Get IT
• Jr. Trainer: Fang + QA
• Misty: Fang Spam     Surge
• Rocket: Fang x2
• Get Full Restore
• Jr. Trainer: Fang x2, QA x2 (QA Pidgey if missed Fang)
• Jr. Trainer: QA, Fang
• Trainer: Fang -> Get Body Slam
• Trainer: QA x2, Fang -> Get Rare Candy
• SS Anne Rival:     > Fang     > Fang     > QA     > Fang + QA
• Shop: Buy 3 Repels
• Cut Menu: Teach Dig over Tail Whip, Swap Slot 1 for Repel, Teach Cut, Teach BS over Fang
• Cans Manip:
• Surge: Body Slam, QA, Dig

Fly

• get Bike Voucher, Dig out

• Bike menu: Swap slot 2 for Bicycle , Teach Tbolt over Quick Attack.

• Jr. Trainer: BS x4

• Bug Catcher: TB x2, BS

• Pokemaniac: BS + WG, TB x2

• Pokemaniac: TB x2

• Jr. Trainer-F: BS x2

• Hiker: Water Gun x3

• Jr. Trainer-F: BS, BS, TB

• Gambler: BS x2

• Get Elixir AND Nugget

• Shop:     > Sell: Nuggets + TM11     > 10 Super Repels + 9 Super Potions     > Poke Doll     > Fresh Water -> Ice Beam -> Fresh Water     > 3 X Acc, 23 X Attack, 7 X Special, 2 X Speed   Flute Swap slot 2 with Repel , teach IB over Water Gun, Use Repel, swap slot 4 with X Special, Teach Fly

• Rival: X Spc + Tbolt, Tbolt, BS, BS, Ice Beam (Xacc if sand-attack)

• Pick up the Elixir

• Dig all Ghastlys

• Rockets: BS everything; Dig Koffing

SILPH Gio

• Fly to Celadon -> Center
• Menu: Repel; Swap slot 3 with X Attacks, use Poke Flute (4 down)
• Get Rare Candy
• Super Repel, swap Slot 5 with X Speed (3 under Xacc), Use Rare Candy x3, Bike
• Get the Full Restore
• Walk to 5F -> Get Elixir
• Arbok: Dig
• Silph Rival: X Atk x4, X Speed, BS x5
• Rocket: Ice Beam, BS, Ice Beam
• Heal if below 50HP
• Giovanni: X Atk x 2, BS, BS + BS, Dig, Dig   KOGA
• Juggler : BS x4
• Elixir + heal to 80+
• Juggler : BS, BS x2
• Koga: X Atk x2, BS, Dig, BS, Dig

Sabrina

• MENU: Repel, swap HM01 for Supers (5 down), teach Surf, toss Xacc, bike
• Get Strength
• Fly to Pallet -> Walk to top of water, Surf
• Get Both Candies -> Teach Strength + Use Candies -> PICK UP THE FUCKING KEY -> Dig out
• Sabrina: X Atk on Kadabra if 90+ (if not, on Mime), BS x4   BLAINE
• Elixir + Super to 80+ -> Bike
• Blaine: XAtk, BS, BS, Dig, Dig + BS (Unless super)   ERIKA
• Beauty: IB
• Erika: BS x3   Gym Gio
• Cooltrainer: Ice Beam
• Blackbelt: X Atk, BS Spam
• Giovanni: X Atk, IB, IB, Dig (BS if miss range), Dig, Ice Beam x2
• Leave Gym: Super Repel, Heal if necessary, Bike   Victory Road
• Viridian Rival: X Atk x4, BS, IB, BS x4 (If you are short on Body Slams, Dig the Growlith)
• After Surfing: Super Repel, Heal to full, Elixir, Bike
• Pick up Full Restore if low on Supers + Deposit all Pokes   Lorelei: X Spec x4 -> Tbolt all, lead BS on Jynx   Bruno: X Atk , IB, IB x2, BS, IB, BS x2     Agatha: X Atk Dig everything; IB Golbat
• Heal to Full   Lance: X Spec x2 + TB, X Speed, IB Spam    
• Heal to 100+

Champion: X Atk x5; BS, BS, Dig, BS, BS, BS