Why has this thread been going on for days..seriously, over bragging even ffs.
It's like if I made a thread about my legit Distortion World/Pl Shiny Giratina that wasn't even RNG'd.
Anyways only legit ways of having a Shiny Mewtwo is:
-Sheer luck in FR/LG/HG/SS..probably forgot where else Mewtwo has appeared.
-RNG'd from the above games listed.
-It's a clone.
Then there's also this:
-Hacked: modded SSID to be "legit" Shiny. Stats, nature, IVs may have been changed too.
-Or just plain hacked, 2 main ways of doing this or something.
This person could have even picked up the Mewtwo through Wonder Trade, I'm sure people here know about the Pokemon Bank being a fail at anti hacked Pokemon.