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Your Pokémon PBS files are from an older version of Essentials. The newer one requires a (Pokédex) Shape for each Pokémon in the file. I think if you search around you'll probably be able to find a PBS with those shapes, this issue comes up quite often.
EDIT: Also, I moved you thread from Games Showcase to here. Showcase is for posting your game's thread, not asking questions. I also renamed your thread to reflect the error message. You don't have to have an explanatory thread name, but it usually helps the thread get more replies.