oops, did it again
Ah, that makes more sense. Someone must have traded a Phantump and then they traded it to me, since it didn't evolve when I got it.Phantump evolves into Trevenant via trade. I kind of doubt that's hacked since I'm not even sure if it's possible to trade non-legit pokemon yet.
But honestly, I don't see why anyone wouldn't want it. That thing is the best member of my team.