Well guess what. You're not going to get what you want, just like me, everyone else in Canada, and 50% of the people in the UK. That means no legit Mew, and no legit Celebi, until Diamond and Pearl is released.
So before you get crushed big time, you should murder all hopes and dreams of you completing your 3rd Generation National Dex, because it probably won't happen. Unless you do what I did and borrow a friend's 'Pokemon-making Machine', but that certain machine is frowned upon by 99% of all natural humans...
I don't mean to bring you down, but I don't want anyone else to feel as angry as I was when my dreams were crushed when the Pokemon People created U.K. and American Events, and ignored Canada completely.