While in the old Japanese Crystal version, you could obtain a GS ball for Celebi's shrine, they've yet to release any way in the newer versions to obtain a Celebi
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You don't need a specific Pokeball. Try Dusk balls (If it is at night), Quick Balls (Very early in battle), Timer Balls (Late in battles), and Ultra balls after you have weakened it. Master balls could also catch it.
Celebi.
catch or obtain a celebi. put the celebi in the front of your party then go to castelia city. go on castelia street the go to the building with the big blue screen. talk to the speechless boy. he is zorua and use prefered pokeball to catch him. (you don't need to battle).
you don't need one. it comes in a event.
you need a .....um I DONT KNOW AND I DONT CARE thanks for reading.