Just need to see Wormadam to finish pokedex and get national-dex (also need to see Garchomp but Cynthia has one so ill see it when I defeat her [if that ever happens, I suck]) if you answer this thnx :-)
There's one! in route 214 I think... If I'm not mistaken, it's a woman! Or you can spread honey to any yellow tree, it will appear Burmy! just leveling up Burmy until lv20, it will be Wormadam!