Stats modifiers notes

Defense :
Dirt stage 1 :
x1.0
Dirt stage 2 :
x1.05 damage received
Dirt stage 3 : 
x1.25 damage received

Charge damage :
Dirt stage 1 :
x1.0
Dirt stage 2 :
x0.95
Dirt stage 3 : 
x0.75
Down opponent :
x0.3

Weapon damage :
Dirt stage 1 :
x1.0
Dirt stage 2 :
x0.95
Dirt stage 3 : 
x0.80
Down opponent :
x0.3

Bomb damage :
Dirt stage 1 :
x1.0
Dirt stage 2 :
x0.95
Dirt stage 3 : 
x0.80
Down opponent :
x0.5

Pod damage :
Dirt stage 1 :
x1.0
Dirt stage 2 :
x0.95
Dirt stage 3 : 
x0.80
Down opponent :
x0.5

Boots speed :
Dirt stage 1 :
x1.0
Dirt stage 2 :
x0.95
Dirt stage 3 : 
x0.80

Soulboost multiplies damage output by 1.5, but gives stage 3 dirt to every single part if it ends.

Robo Styles :

Power Style Robos get x1.05 damage boost

Shining Fighters, Aerial Beauties, Sassy Stunners, Wild Soldiers, Big Boys, Old-Timers, Trick Flyers, Strike Vanishers, Burning Beasts, and Lightning Skyers that are not Power Style robos have a x1.0 damage multiplier.

Metal Grapplers have enhanced attack. Rock Hound has a x1.11 attack multiplier while Metal Ape and Crazy Baboon have a 1.05 multiplier.

Little Raiders and Little Sprinters attack values have a x0.95 damage multiplier

Snipe has x1.05 attack, Freya has x1.11 attack, Violent Boar has x1.25 attack, Katana has x1.11 attack, Hadron has x1.05 attack, Jameson has x0.95 attack, Majel has x1.0 attack, Ray II Dark has x1.0 attack, Chick has x1.0 attack, and Carat has x0.95 attack.

AIRS has x1.35 attack.

Ray has x0.95 attack, Ray Mk II has around x1.02 attack, X-Ray has x1.05 attack, and Ray 01 has 1.05 attack.

Ray Sky's multiplier varies depending on the version of the game.
If playing the Japanese version of the game, you have the "option" of getting 1 of 3 differently colored Ray Sky robos. As such, here are their values and styles:
            Blue: x1.05 (Power style)
            Red: x1.05 (Armor style)
            White: x0.95 (Speed style) 

If playing any localized version of the game, you will always get the Blue Ray Sky, which results it it being a Power Style with x1.0 attack. 


Sources :
- https://customrobo.fandom.com/wiki/Attack_Stat
- My own testing

Dracau

Custom Robo Arena