Board Thread:General Discussion/@comment-85.247.160.27-20141105195358/@comment-24931906-20141211092602

Assuming you still want to evolve him, My guess is you don't have enough of the required evo mats/Zel/Levels.

If that's not the problem, it's most likely a bug of some sort. I recommend either resetting your game or redownloading it. If that doesn't work, just contact Gumi and see if they can do something about it.