What happens if, in a double battle, you send out a castform and a Kyogre holding a blue orb? Will castform change to its water form or will it stay normal? I'm really curious
>During rain or heavy rain, it will become Rainy Form, which is Water-type.
Castform will turn into a Water Type if Primordial Sea is in effect when Castform is in battle, as Primordial Sea causes the weather effect heavy rain.
Hope I helped!