Colress

Colress (known as Achroma in Japanese) is a prominent antagonist in the Pokémon anime, specifically appearing in Pokémon the Series: Black & White (Best Wishes series), particularly during the Episode N arc involving Team Plasma.

He is portrayed as a brilliant but ruthless scientist working for Team Plasma, serving as one of their key researchers under Ghetsis. His primary obsession is unlocking and amplifying the hidden potential and strength of Pokémon through experimental means, often using advanced technology like his signature controlling device or machine that manipulates and forces Pokémon to obey or enhance their power (sometimes against their will).

Appearance-wise, he has distinctive blonde hair with a prominent blue cowlick, yellow eyes, glasses, and typically wears a long white lab coat over a black uniform with blue accents, giving him a classic mad scientist vibe.

Personality in the anime leans heavily toward sadistic and villainous—unlike his more morally ambiguous or redeemable game counterpart, he's depicted as a cold, enthusiastic experimenter who shows little regard for the well-being of Pokémon or people in pursuit of his scientific goals, often delighting in the results of his cruel tests.

He plays a major role in Team Plasma's schemes during that Unova storyline, clashing with Ash and the heroes while advancing their plans involving legendary Pokémon like Kyurem. No redemption arc for him in the anime—he remains firmly antagonistic and ends up arrested with the rest of the group.