"So a Psychic-type, then? A lot of them can talk with their thoughts." Not to mention he's met a Meowth that could talk as well, but her mentioning communication through thoughts makes his mind immediately leap to Psychic-types.

As they talk, the heat in his fingers gradually fades away in the cold water, and he withdraws his hand from the lake. They're still a bit red and shiny where they touched the star, but that's just from the damage that's already been done -- he's successfully prevented further harm. So he steps away from the lake, offering Amber his hand to help her away from the shore too.