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I have to admit I don't know anything about G4, so I can't give any detail myself, but I found this pony on MLPMerch, hope this helps a little:
My Little Pony Wave 19 Midnight Fun Blind Bag Pony | MLP Merch
My Little Pony Wave 19 Midnight Fun Blind Bag Pony details page.data.mlpmerch.comMy Little Pony Wave 19A Midnight Fun Blind Bag Pony | MLP Merch
My Little Pony Wave 19A Midnight Fun Blind Bag Pony details page.data.mlpmerch.com