It's possible. I just sacrificed Uxies by letting them get ko'd so they would accumulate damage on Rampardos, Uxie swarmed, then tied it all up with an unexpected Sacrifice/KO with Gigas X to take that last prize. Palkia X is key to the matchup. I didn't think about it at the time, but I also couldv'e used Deafen on Dialga G X to lock him from playing down fossils...
It was more luck than anything. He didn't get Rampardos up till like T3.
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BTW, I just realized that Ghetto Overlord is Nate B from VA! Gigas will take VA states in Seniors and Masters! I can see it! You should get your lil bro to play it too, so it can take all 3 divisions!