>>53569254I think you're trying to fit in too much, Gardevoir already takes so much space.
Zoroark feels unnecessary, baby Garde and Zacian already nuke anything in their path, and Zoro can't be charged up by Garde. Also DTE doesn't fit with Garde either.
I'd replace Zoro & DTE with the missing Ralts, Kirlia, 1 baby Garde, and 1 energy.
Rocky helmet isn't a very good card, I'd replace it with another seal stone for consistency and emergency jelly or something.
7 supporters is low, you need more. More balls too, especially level ball which can grab you Ralts and Kirlia. Garde also ten to play VIP passes since there's so much setup to do. I'd remove trecking shoes, you can use Kirlia and ultra balls to discard energy.
Greninja does indeed combo well with Garde, and once you're set up, 20 damages shouldn't make a big difference. Same reasoning with old cemetery, it's cute but you already 1hko anything. Temple of Sinnoh would allow you to slow down Mew & Lugia while you set up.
I've seen some Garde lists play Hatterene V for acceleration, you should look at tournament lists for inspiration here :
pokecabook.com/archives/33500 
