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Shining Mewtwo is poignant as its generic grey silver isnt quite the same alien shade as it was in the Gen 2 sprite, I dunno, it was also a mistake it and others palette changed for the worse after the debut shine generation (Hounds/Tyranitar/Mewtwo/Lugia)

Therefore, using this card with other Grass-type Pokmon, or other Pokmon which can mete out poison attacks, is a great choice

That being said, the Amber and Emerald deck isnt bad per se

Ashcoat needs to be attacking or blocking to trigger its effect, so make sure it's either attacking safely or blocking a weak creature as Ashcoat will not give itself a stat boost