I know the appeal of Leafeon's name comes from phonetics, (y'know, lee-fee; it sounds kinda nice,) but I still wish it had been called Virideon. From latin viridis, meaning vegetation/plants/growth and also freshness/youth. It fits with Leafeon's elf-like nature. Virideon also sounds like viridian, a shade of green, and also a forest in Kanto.