Pokémon X and Pokémon Y

Same, it looks amazing.

Wonder if that ghost sword evolves?

There has been wild speculation that there might be a Shield pokemon too, and that they might have a combined evolution.

Either that, or it might evolve into a possessed suit of armour, which I honestly think would be badass, but might be too similar to Escavilier/Gollurk

Either way, it's going to be an awesome pokemon. Steel/Ghost gives it only 2 weakness, Ground and Fire, and it floating suggests it might have Levitate, giving it only a weakness to Fire. Plus it's a given it's going to have Swords Dance.