Mega Evolutions everywhere!
Pony Pokemon cards seem to make a bit more sense. You don't need them to evolve for them to be interesting, and you can really add some nice card effects. There are a lot of different card types that just seem to synergise perfectly with the fandom of MLP, such as types, Legends, Lv X, Pokemon EX, and so on, but still with the evolution options. Image citation has been added as a comment by me.
Revival Herb, because it gives -15/20 to friendship while fully reviving Pokémon, having the strongest drop (minus trading which resets). Why primary Normal-type? Normal-type is a gimmick, unspecialized "default" type, many Normal-type Pokémon learn various elemental moves. Also, Puddinghead's evo is something aka Burmy/Wormadam... Oh, and if anyone ask WHY the Gala Pie is the only evo to still be able to change forms? Well, it's still normal Pinkie Pie, but stronger, unlike other evo.