I'm in agreement with pretty much everyone else here. Either keep the original typing like Volcarona, or go with Bug for the first evo and then move onto Bug/Psychic for the second. You can still have your cacoon with that typing, it would just be a but more like Darmanitan Z over something like Metapod for example.
I don't really understand Ghost or Dark as other typings. It just doesn't make any sense. Ghost would infer some sort of coming back to life effect, and Dark would put forward the idea that it's prevos are more evil and sinister. I'd like a pretty cutemon as the first evo to be honest!
I'm on a mission to train every Pokemon Family during a playthrough of 3rd to 5th Gen! Currently at: 532/602!
Current Team (White 2 [6 badges]): Ninetales/Zoroark/Mr Mime/Cherrim/Sawsbuck/Swampert
Current Team (Black 2): Solrock/Emboar/Sunflora/Crobat/Dunsparce/Azumarill