Move Options
-Physical: Seed Bomb, Zen Headbutt, Sucker Punch, U-Turn, Return, Secret Power, Facade, Aerial Ace
-Special: Grass Knot, Psychic, Leaf Storm, Energy Ball, Giga Drain, Ancientpower, Earth Power, Silver Wind, Signal Beam, Water Pulse, Shock Wave, Charge Beam, Shadow Ball, Hidden Power
-Status: Substitute, Calm Mind, Baton Pass, Recover, Leech Seed, Toxic, Rest, Heal Bell, Reflect, Light Screen, Safeguard, Thunder Wave, Swords Dance, Stealth Rock, Skill Swap, Worry Seed
What can we say about Base 100 Stats across the board that isn't obvious. There are 71 Pokemon (all forms included except those belonging to Arceus) that outrun Celebi, but few carry Bug Type Moves (which, STAB or not, will hurt a metric ****-ton with that Quad-Weakness), and 24 tie it in Base Speed.
On Abilities, you're always using Natural Cure. Natural Cure + Rest is an annoying combo to deal with. The Ability pairs wonderfully with U-Turn to get some chipping in or Baton Pass to transfer your buffs while making an escape.
On the notion of Baton Pass sets, Ancientpower and/or Silver Wind are options to consider, even with the mere 10% chance of buffs, and Charge Beam makes an excellent option as well. However, you'll mostly B.Pass Swords Dance or Calm Mind buffs instead of gambling on the buff chances, so they're low priority choices.