well all i no is you need the walk though cheat and you now where that boat is in
vermilloncity go though the sailor and its a short surf away from there then use stenth
to move the truck and mew is under it!!!!

some cheat

after capturing/defeating mewtwo, go to the elite four and defeat them 30 times, now go to
the cave where mewtwo was in. Go two where mewtwon was and search around on that area. You
will eventually run into a mew

go into a pokemart and go to the square memo pad on the counter and put, "Link together
with all".(capitalization doesnt count)The marketer will react and give you a mystery
gift. Save the game and turn it off. Then turn it back on and go to mystery gift and
select wonder gift.

a gameshark.