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Absolute best case scenario, we unlock a "Platinum Episode" after beating Cynthia that starts up a postgame episode and gives the updates and other things that were in Plat (adds snow to the ground, unlocks new clothing options, opens new areas for additional exploration).
Medium case, there's still a simple postgame episode involving Giratina but no extra bits from Platinum are added.
Worst case it's just a trek through Turnback Cave like in the original to get it.
