>>58032784because they like good looking designs
things that look good on pokémon:
being slim and regal (Serperior, Milotic)
being strong and scary (Nidoking, Haxorus)
being big and bulky (Torterra, Venusaur)
being cute and adorable (Pikachu, Snorlax)
things that look bad on pokemon:
being skinny and lanky (Inteleon, Sneasler)
being brutish and stupid (Incineroar, Rhyperior)
being fat and derpy (Dragonite, Lickylicky)
being babyish and weird (Igglybuff, Smoochum)