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Then youre in luck

Being a Level 7 Monster, it could be used with Red-Eyes Black Flare Dragon to summon Rank 7 Xyz Monsters

I have done my best to add which packs contain the errors to the table

To get Mewtwo EX and Gardevoir, you'll want to focus on the Mewtwo Booster Packs before opening Mythical Island packs for Leaf and Mew EX: Core Mewtwo EX Cards 2x Mewtwo EX 2x Ralts 2x Kirlia 2x Gardevoir 1x Mew EX 2x Potion 2x Pok Ball 1x Pokmon Communication 2x Mythical Slab 2x Professors Research 2x Sabrina Flex Mewtwo EX Cards Mewtwo EX is a pretty tight list without a lot of room for experimentation

The next UPC(s) could be a good product for that, if they continue to feature 3 FA/SIR/Gold cards

If the game expands enough, Pokmon is forced to step up their game and provide better prize support, coverage, etc