I know that this has been done before, but I'm thinking for my Mystery Dungeon series to have this weirdly colored vaporeon. She would learn all vaporeon attacks, but she would FOR SURE have the move headbutt. (The dot on her forehead representing goldeens horn)

and.. maybe have moves that are shared between the two species? such as Water Pulse, Aqua Ring, Agility...

BF says the most OP ability combo for this would be Lightning rod and hyrdration.. Don't know if we're gonna use that as that is HIGHLY situatiuational.

Idk, im just thinking.