Considering I've spent a lot of time building a Gardevoir deck this is pretty annoying, but it's not just Gardevoir but every deck in the meta.
First off, 120 and acceleration for a DCE is way too powerful. Meaning it can use max potion with no real drawback if it gets hit. With Ultra Road it has free retreat, and with the ability it can't be OHKO'd. Also, no reliable way to turn off abilities without using Garbotoxin (which a lot of decks don't have space for and don't want to use). Spread damage with Necrozma/Weavile is not much of an issue because of the healing GX attack. Devolving with Espeon can be prevented by teching in Magearna. So far this deck is looking pretty unbalanced.