PSA and CGC both work well for this card
Grimgrin acts as both a removal engine and a growing threat, combining sacrifice synergy with commander damage
Often, these abilities or attacks specifically target Pokmon with ruleboxes, such as the Pokmon ex cards that appear in Pokmon TCG Pocket
There's a lot of good ways to do this, ranging from Deranged AssistantDeranged Assistant to add mana and self-mill, to Search for AzcantaSearch for Azcanta for mill (plus some card advantage later down the line), to cantrips like Mental NoteMental Note for more synergistic milling
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As for the new Tarkir: Dragonstorm cards you could add to the main deck of other Commander decks, Deceptive Frostkite stands out to me