Bugs are not animals anymore I guess! :P
At this point, Game Freak is capable of going with either option. I hope it'll get Levitate if it doesn't get a cooler ability!
Read the entire post, I go on to talk about how the flying capabilities of insects and dragons are properly represented by Venomoth, Beedrill, and Dustox's bug-typings, and Flygon's dragon-typing, respectively. What the hell is Koromori? It's a puff ball with wings, there is no other typing that could represent its flying capabilities other than flying (since it doesn't look bug- or dragon-type).