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So the Aether spent an absolute fuckton of money on manufacturing Beast Balls (estimated to be around 100 million dollars at very least), but you can still use a Master Ball and secure any UB without fail.
There are multiple Master Balls in existence, as one is almost guaranteed per game. You can get even more by winning the lotto ID games at various institutes, too.
What the fuck was the whole point? Couldn't they just commission Silph Co. to manufacture enough Master Balls to contain the UBs?