i gotta agree with Smite regarding metal sound and screech even though it isn't metal all of it's evolutionary chain is based around annoying noises it wouldn't be bad to give it those, also i loved the odd typing, the stats are pretty well distributed and it has the caracteristic shallow movepool that is common to most bug types, looking forward to see when this thing gets a sprite, but first.
*Izanagi tosses a POSITIVE on cofagragus's face*