ShadowGuard
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Garchomp Lv.X is a tech, not a card you base your strategy on.And mewtwo lvx will be the end of garchomp lvx.
The deck still runs standard Garchomps that can be set up as Stage 2 Pokémon.
The only deck Mewtwo will own is Azelf/Uxie/Mesprit.
btw straight grass Leafeon / Sceptile still has problems with Magmortar. Even if you shut off the weakness with Umbreon, Mag can snipe your Sceptile/Espeon/whatever.