I need it
You need to have completed all the quests then you will have one last quest by Ollie's mom.
Source:me:)
Complete all 59 Sidequests.
It will show up in Vien Forest.
Source: http://bulbapedia.bulbagarden.net/wiki/Celebi#Game_locations
You can find it in Vien Forest.
Vien Forest (After Completing all 59 side quests) -Bulbapedia
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