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You look through your closet

Your chosen commander must be either a legendary creature, or a card whose rules specifically state that it can be your commander

If the copied creature is copying something else, then Aurora Shifter becomes a copy of whatever that creature copied (with the listed exception)

To help you catalogue them accordingly, we've got every single Promo Card in Pokemon TCG Pocket laid out below, with details on how to obtain them and which cards (like Lapras ex or Shiny Mewtwo) are now no longer available unless the game decides to reissue them later on

It seems that Koraidon is a bid worse than Miraidon because you will end your turn once you use its ability