Metamon

In its natural state, Metamon is a light-purple or pink blob-like Pokémon with vestigial facial features. It is often referred to as amorphous, but has a relatively consistent appearance in official artwork, including two small nubs on its "head", a few soft lumps at its base, and two pseudopod-like protrusions in place of arms. The face consists of beady eyes and a simple mouth; almost always pulled into a smile.

It is capable of transforming into an exact replica of any physical object or living creature, including its form and abilities. Each Metamon has its own strengths and weaknesses when it comes to transforming; being unable to remain transformed while laughing and getting details of its transformation wrong if based on memory being apparently universal.