Smeargle

Attacks

Paint
Flip a coin. If heads, choose a type (other than colorless) and put a Coloring counter on the Defending Pokémon. That Pokémon is now the type you choose. If it already had a Coloring counter, remove the old one. If tails, this attack does nothing.

Once it becomes an adult, it has a tendency to let its comrades plant footprints on its back.