FusionDex

Rockrua instinctively transform into unremarkable stones when sleeping. While effective at keeping wild Rockrua safe from predators, it can prove to be inconvenient for Trainers who search high and low for their missing Pokémon after naptime.

To protect themselves from danger, they hide their true identities by transforming into people and Pokémon. This Pokémon has lived with people since times long ago.