Board Thread:LOC General Discussion/@comment-24.240.114.199-20140326060727/@comment-5428123-20140326063124

It's locked (like every new event card is) so of course you can't evolve it. Just wait until Applibot gives an admin notice, saying that they've unlocked it, and you should be good to go. Hope you're patient though, because they take like 2-3 events to unlock cards (I think one time they ended up unlocking BR event cards after the next BR event was over).