If you decide to include Jigglypuff/Clefairy do pick Cleffa, when it gets cosmic power and stored power you can sweep a ton, it made most battles easy, also, watchout for Aya she is madness, specially with a mono fairy team.
My advice is teach Combusken Bulk Up and get it to +6 in the battle, it can take lileep's and glaceon's attacks pretty well and when you're low on health just heal, afterwards proceed to sweep with double kick, thats how i beat them with my Combusken.