While not every creature with flash is so egregious, there are still a lot of powerful cards out there that can be used to catch your opponents with their shields down
It sounds like an absolute mess and Id totally play that
Pokmon LV.X cards (LV.X stated next to the Pokmons name): LV.X cards are like an extra level or stage for your Pokmon cards
Artifact and utility tokens: print the text For Treasures, Clues, Food, Blood, Powerstones, and similar, the whole point is the ability
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So I would run something like a 3-1-1-2 line, with three Eevee, one Jolteon, one Vaporeon, two Flareons, or something like that