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It can be found in the Eevee Grove pack from the EeveeGrove set

However, this new support gives the Dark Worlds some much needed tools, such as Reign-Beaux, Supreme Overlord of Dark World (YGOrg Translation) , who serves as more copies of Grapha while tutoring higher leveled Dark World monsters when discarded and a new boss monster in the form of Grapha, Dragon Overlord of Dark World (YGOrg Translation)

Special Summon this card while it is banished

Damage Swap - As often as you like during your turn (before your attack), you may move 1 damage counter from one of your Pokemon to another as long as you don't K-O that Pokemon