I think Colress was a really great character. Although they could've weaved him into the plot with some more involvement, they did a good job designing him. His name, music, even Pokemon choice (favoring robotic or mechanical pokemon) all suit well to his personality as the "unethical scientist". He's neither good nor evil (he's colorless, haha!), and just did the things he did to bring out the full power in Pokemon, not caring about cruelty, or (apparently) the rest of the world potentially freezing over.