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add a sandy form for sandstorms
Mega Castform
Normal
Ability: Weatherman (Changes Type and Weather based on the attack it uses, weather and type change before damage calc)
HP: 70
Attack: 90
Defense: 90
Special Attack: 90
Special Defense: 90
Speed: 90
mega-sunny form- 40 spatk increase
70/90/90/130/90/90
mega-rainy form- 40 speed increase
70/90/90/90/90/130
mega-snowy form- 40 def increase
70/90/130/90/90/90
mega-sandy form- 40 atk increase
70/130/90/90/90/90
can now also learn stealth rock and rock slide
doesn't actually have to look anything like pic related though