Used masterball on groudon, and I regret it so much, and I beat elite 4 again, so I get a save right before the fight.
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SirDiesalot1
25 ultra balls, and I finally caught it!
True dinklewinkle
Yay now you have to grind it to level 100!
It's the hardest one to catch in the game (at least in my opinion) and you have to go through so much to even get back to it, and you're never gonna use the Master Ball anywhere else if you haven't already, so why try?