I'll soon be offering commissions for the first 151 pokemon ponies that I'll be uploading in bunches over the coming weeks.
Keep a sharp eye out for more!
Even though it is part Bug-type, it could not learn any Bug-type moves until Generation III, not even by TM. Even though the 'main' part of its body is purple, it is classed as being white in the PokÚdex. This is likely because the large wings of Butterfree are mostly white. While Butterfree cannot learn Iron Defense itself, it can be taught it as a Metapod before evolving.