Well if you can discuss a Buneary moveset then I can discuss a Gengar moveset.
Standard Special: Nightshade
If you've seen the anime you've seen Nightshade in action. Gengar emits a sort of dark thunderbolt from its eyes. Looks pretty cool.
Side Special: Lick
Gengar licks the opponent paralyzing them temporarily.
Down Special: Destony Bond
I'm not sure how this'd look, but Gengar's destiny bond in the games makes the opponent faint if they faint Gengar. So perhaps when the opponent attacks Gengar while he is doing this move, they get the same damage that Gengar gets.
Alt Down Special: Dark Pulse
In Diamond and Pearl, Gengar learns Dark Pulse naturally which is pretty cool. Gengar hits the ground with his foot which then emits a dark wave that hits nearby enemies.
Up Special: Shadow Fade (meh, need a better name)
You know how Gengar can fade and then reappear anywhere he pleases in the anime? Well press up + b and you'll do the same here.
I realize Gengar isn't hugely popular, but he's my fav so shut it.