... ok blue, you've got my attention, now you can admit you're lying =D becoz thats what you're doing...
... either your game screwed up from extensive cheating (but i doubt the consequences of that would bring you a mew...) or your brain is screwed up from extensive gaming... take a deep breath, drink some water, goto bed and wake up the next morning and check your game pack again... is it gone now =D ??? it should be =D ~~~
... i'm not even gona bother arguing how bogus that cave/mew thing is... please don't lie, your credibility lies in the balance ...
(btw i've beaten the elite four N to the Nth square times... and my bro constantli mucks around in the caves training up pokemon ... i think it is safe to say there is no mew there... even at the spot you said... trust me my bro has around 12 hours game time in the caves alone -_-" ... sad but true *but he's allowed to be sad, he's 9*)
Frank