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I think I've just discovered dupe glitch. The first Shiny Alpha Lopunny was taken to Vert 8 before capture and nothing happened. The second Shiny Female Alpha Lopunny I caught today was Naive and brought to and captured at Zone 1. I immediately went back to Zone 18 to bench farm some more but another Shiny Female Alpha Lopunny appeared. Highly lucky maybe? I also took this one to Zone 1 for capture. Again it was Naive but also the IVs are exactly the same. I fly back to zone 18 and another Shiny Female Alpha Lopunny is there. There is absolutely no way I am this lucky. I haven't taken this one back to Zone 1 yet but I will not be surprised if it has the exact same IVs and Naive nature as the previous two.
Maybe there's something with dragging an Alpha to Zone 1 that makes the original respawn location think it hasn't been captured yet? Maybe there's also a distance factor and Alphas near Zone 1 can't be duped? Please test.