Just a curiousity, but Couldn't Burmy/Wormadam have had a 4th form for if they evolved in water? Think about it, what would happen if you trained a female Burmy in the water? The most logical thought would be that it would become a sort of water-cloak Wormadam after it evolves. Burmy supposedly cover itself with materials from wherever it's at, so if at sea or rivers, they could gather a seashell or seaweed cloak, making a sea-cloak Wormadam. Although, Burmy at sea could argueably get sand cloaks from the floor underneath the waves, but what do you think about this?