The level of ignorance in this thread is staggering. But of course, you all knew it would only be a matter of time before I'd be here, posting in a thread like this. I knew all too well that people like you would be here, attempting to poison the mind of the thread's starter with your vicious and vile lies about how the Celebi Glitch doesn't exist. char char, I speak as a person who has seen and captured Celebi when I say that the Celebi Glitch DOES exist. Celebi can appear in the wild on Routes 121 and 123, but it is even rarer than a shiny. If you want to go looking for it, I'd suggest you take a Master Ball and unlimited patience. I've heard it is capable of fleeing, but not wanting to test that rumor, I chucked the Master Ball immediately upon seeing it. It's only in Ruby and Sapphire, however- not Emerald.
Serebii is reputed for disliking glitches, so of course he wouldn't have it on his site.
And don't anyone even ATTEMPT to use the Celebi Game Mechanics page as proof of the glitch's alleged nonexistence. It is nothing but a load of Tauros feces.