I'm afraid they got the Physical Celebi set from me.
Celebi w/ Life Orb
220 HP / 252 Atk / 36 Spd
Adamant nature
- Swords Dance
- Zen Headbutt
- Seed Bomb
- Sucker Punch
Life Orb Sucker Punch can revenge kill various threats if they're already damaged, and Grass-typing affords her notable resistances that can allow her to set up Swords Dance with relative ease. She works especially well with Iron Defense Baton Pass Scolipede, who tends to lure Rotom-W. If my opponent has a Rotom-W on their team and doesn't have Heatran, I have a reasonable guess that they'll switch it in as soon as they find out what set Scoli is running. Baton Pass to Celebi on the switch and nuke 'em with Seed Bomb. Also, at +1 Celebi outspeeds Adamant Talonflame and can OHKO with +2 Sucker Punch when they go for Brave Bird. At +2 Def from Scoli, Celebi also walls Dragonite. Heck, she tanks him pretty decently anyway.
Also, I think that the pixie team is a ladder-trolling alt from someone else in this thread.
Oh, and by the way, Hydro Cannon/Blast Burn/Frenzy Plant/Hyper Beam/Giga Impact actually aren't all that bad in 1v1, as long as you make sure they KO the opponent. For instance, Mega Charizard Y Drought Blast Burn is terrifying, as is Mega Gardevoir's Pixilate Hyper Beam (especially at +1). Likewise, Mega Pinsir's Aerilate Giga Impact hits very hard.