>>47199115In terms of character designs alone? Definitely Vega and Procyon. Only nips know how to make good pokémon character designs.
In terms of character and development? Hard to say, most characters have as much development as a cardboard box in ROMhacks. That is if there even is any original characters in them.
Reborn / Rejuvenation are the only games where the characters actually have character, but they come off as edgy and cringy for most people here.