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I want to modify catch rate of Gmax pokemon, but I don't know how to do it. When I modify catch rate of 'Pokemon' tab to 255, it doesn't work : ex) I can't 100% catch Gmax charizard when I don't use Wishing Piece. How can I modify the catch rate of Gmax pokemon with pknx?

Thanks alot!

What I want to do is creating legal gigantamax square shiny charizard with pkhex in swsh. I've found the seed, pid, ec for my gigantamax shiny charizard with RaidFinder and this is the result. seed : 1EC5B221174366B6 pid : 7784938C ec : 39E0D111 HP:31 A:28 B:31 C:31 D:31 E:31, Hidden ability, Male. I put all of these info to my gigantamax charizard, but my charizard didn't become shiny automatically. so I clicked the 'star' next to the 'pid' section to make my charizard shiny, but the pid was automatically modified(=pid was rerolled) to something else (= not 7784938C) How can I create shiny pokemon without rerolling pid, for putting '7784938C' pid in this situation?