As The Mimeoplasm enters the battlefield, you may exile two creature cards from graveyards
Fernando Palmero Garcia got himself a Mox Emerald
Alongside the Genetic Apex and Mythical Island sets, Promo A cards are available for players to find while playing the game, but require specific mechanics to add them to your collection
They've been playing the beta, and you can find out exactly how it plays in the video below: It's been years since I've played a round of Pokmon TCG - I sadly had to bin most of my original decks when I was clearing out boxes of stuff I'd left at my parents' house - but more recently I've been enjoying getting reacquainted with it by watching calm and collected folks unbox reams and reams of booster packs on YouTube

Coronet, Rotom, Unidentified Fossil, Electric Memory, Looker, Yanmega, Pal Pad, Skuntank, Gardenia, Purugly, Floatzel, Missing Clover, Turtonator, Bronzong, Volkner, Cosmoem, Pokmon Fan Club, Gabite, Monferno, Fire Memory, Order Pad, Drifblim, Mars, Lopunny, Manaphy, Cynthia, Grotle, Escape Board, Alolan Dugtrio, Unit Energy LPM, Prinplup, Oranguru, Looker Whistle, Floatzel, Lillie, Magneton, Pal Pad, Luxio, Shieldon, Unidentified Fossil, Cherrim, Gumshoos, Ancient Crystal, Spiritomb, Rotom, Unit Energy GRW, Cosmoem, Looker, Yanmega, Purugly, Skuntank, Electric Memory, Turtonator, Mt
It has the same weakness, resistance and retreat cost as the Raticate you're evolving it from