I suppose? But I think sp. attacker Celebi is better off running Life Orb or Leftovers + Calm Mind, because of Pursuit T-Tar and Scizor (well, there's not a lot it can do to T-Tar, but Giga Drain will put a dent in it). If it's spec'd it'll be KO'd since it's locked into a move.
Celebi @ Choice Specs
Ability: Natural Cure
EVs: 252 Sp. Atk, 252 Speed, 4 HP
- HP Fire
- Giga Drain
- Earth Power
Imo Keldeo, Latios or Jolteon would be better Spec options, even though Latias is weak to Pursuit T-Tar & Scizor.