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The fact that the UB ball is simply called "n/a" in the data worries me a bit.
Either that means it won't be implemented as an item you use, meaning that UBs might not be catchable (yet). Or it could mean that UBs are forked over to you for free in the post game.
I'm hoping there's at least a nifty sidequest you need to go through to obtain UBs.