Gen 3's Pokemon were made to be cooler in contrast to Gen 2's more babyish designs though

>“I see. Most Pokemon in Gold & Silver were of the cute variety, but this time…”

>Sugimori: “Indeed, there were a lot of kiddy designs, and some fans were starting to say Pokemon had become too babyish, so one theme for Ruby & Sapphire was returning to the coolness of monsters. We added more and more cool, tough-looking, monstrous Pokemon, a philosophy best exemplified by Groudon. And the second big theme of Ruby & Sapphire was taking on new inspirations for Pokemon unlike anything we used before.”