Ghastly ;)
Sableye ( not my favorite but if you want it you want it )
Litwick
Annhilape ( really hard to do tho )
Shuppet
Duskull
Mimikuy ( I don't thinks it for the story tho )
Shedinja (mehhhh)
Honedge
And need to know that the Pokémon that will win will not have any other of is second type for example no other steel then honedge