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(There is no way, except having the Japanese Crystal, the GB Mobile adapter, living in Japan in 2002 to get a legit Celebi.)

edit

You are right : Glitching =/= cheating, beacause it uses weaknesses of the game's mechanics, so, even if it's not deliberate, glitches ARE implemented and are part of the game : you are not using another device than the game to make glitches work.