You need a certain monster on the field, sacrifice two other monsters, then play the appropriate Spell Card to transform the first monster
Videos by ComicBook.com As expected, the cards all have abilities tied closely to their associated lore
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Mewtwo & Mew GX SR[SM11 097/094] Set: Expansion Pack Miracle Twin #22
Weakness: Water (x2) Resistance: none Retreat: 1 Charizard Fire HP150 Stage 2 Evolves from Charmeleon Ability: Energy Burn All Energy attached to this Pokemon are [R] Energy
Joltik Box A super aggressive deck, Joltik box relies on the incredible energy acceleration from Joltik to power up another big electric type like Iron Hands, Pikachu, or Miraidon