Also, apparently there's a glitch in PMD2 where if a Pokémon with a 10-character-long name tries to evolve, the game will freeze. Sorry, Pyromancer the Chimchar...
EDIT: Why are there portraits for Sunkern in GTI?
EDIT2:
Bulbapedia wrote:In Pokémon Mystery Dungeon: Explorers of Sky
Luminous Spring freeze glitch
In North American releases of the game, the game will freeze if the player attempts to evolve a Pokémon whose nickname consists of exactly ten characters, unless it was the last Pokémon obtained. The glitch was fixed in the European and Australian versions of the game.
Good news! Pyromancer CAN evolve!