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What if a battle against a legendary Pokemon had it take place with greatly inflated HP and you're meant to defeat it, and then you capture it with a ball of your choice at 100% catch rate, with it un-capturable beforehand unless you use a Master Ball?
For example, a typical level 70 Groudon would have around 230HP, but with the new method it has 1150HP. wild legendaries no longer have Recover, Rest or Roost in their movepool at their encounter level.