Single evo Ghost and Steel/Faiey is a good idea in my opinion. It may be costly but has the same effect.

It would be cool if abilities came into play but that could get confusing.


Edit: No evo i meant, not single evo.

Magearna.
Mimikyu could be good as well.

There is one pokemon i have my sights on that is near unstoppable, in a game like this. But, i will keep it to myself.