ok first, it sucks, beat the pokemon league 100 times
birch calls u and says he wants to give u suprise
its some weird device
walk around in the grass in route 120
the device will start blinking
that means celebi is in the present time!!!!!!
go to birchs lab
he will say he saw a small creature flying around
go to the grass right outside lil root town
after like 5 encounters with pokemon, u will find celebi
hes on level 25
if u use a ultra ball, ull never catch it
u have to use a poke'ball
it will work the first time
celebi is invincible
its ability is something strange
after every attack ur opponent does it heal itself
its best move is time travel
u can use it!
it flys hight(looks like it does) 1 turn later it attacks, its damage is 150
pretty sweet huh
try this hint
it should work