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Latios GX 223/236 is a Full Art Pokmon card and belongs to Full Art cards of Unified Minds series

Until end of turn, your life total cant change, and permanents you control gain hexproof and indestructible

So unless I missed something else in my admittedly quick and simple search, I'm going to stand by my statement

Equip only to a monster you control, if it was changed from face-up Attack Position to face-up Defense Position this turn

That said, the preview video gave us clues as to how the set might limit the story

(2021-03-19) If a card with flashback is put into your graveyard during your turn, you can cast it if its legal to do so before any other player can take any actions