Pokemon evolve. Feebas don't exactly stay ugly... but you gotta take care of 'em, or they'll never reach their full potential. Pretty sure that involves making them look as good as possible, but I've never worked with one hands on.

[That's always been the... interesting thing about them, compared to Magikarps. A gyrados would probably be easier for Riku to obtain. Just switch train until it evolves. Easy.

Beauty, though? Ha... Now there's a thought.]