If true, it's referring to essentially the only scale-covered mammals in the world. Scales would indicate armor, thus be more in line with a warrior than a rogue.
Sorry, I forgot Breloom. I didn't know about Virizion though. I haven't finished Gen V yet.
Edit: Since I'm petty, these are the top two results for my Google search with "Quilladin" and "Rogue":
Quill + Paladin
Quilladin=Palladin?
Warrior, Mage, and Rogue
Pokédex blurbs:
Official Pokémon website.
Notice that Chespin/Quilladin are all about the armor/shell, while Froakie and Frogadier are about it's jumping/agility?
Heck, Quilladin's species name is apparently "Spiny Armor Pokémon".
2nd Edit: Separate info, apparently Fairy's full effectiveness list is now available.
Type-Chart
Steel blocks Fairy well too, but the interesting thing is confirmation on giving Poison another type to do well against (about time), and Steel does double damage to fairies too (which, in addition to giving Steel a much-needed attack boost, also makes sense from a lore perspective. Iron is, after all, the bane of the Faerie world).