Its Mew, the pokemon thats been uber for 4 gens in a row wound up in UU! Mew is a forced to be reckon with in UU because its both unpredictable and ruthlessly strong. Its capable of running 3 different "main sets" (it can do a lot more though!) each with their own sets of counters. There are many who think Mew should be outright banned. Will that be the case in the future? Or will Mew move up to OU when the tiers stabilize? Or will it remain in UU? More news at 11.
Type: Psychic
Ability: Synchronize
Base stats:
HP: 100
Atk: 100
Def: 100
SpA:100
SpD:100
Spd:100
Common movesets:
Counters: Mew itself is difficult to counter, because it has different counters depending on the moveset. NP sets typically lose to Spiritomb and are checked by faster hard hitters like Choiced Crookodile & Zoroark. Support variants are wrecked Houndoom. Countering BP is tricky because Mew can Baton Pass at any time. Hybrid Nasty Plot sets w/ Baton Pass are also tricky to deal with. Will Mew end up being to broken for UU? Its possible, stick around to find out.

Type: Psychic
Ability: Synchronize
Base stats:
HP: 100
Atk: 100
Def: 100
SpA:100
SpD:100
Spd:100
Common movesets:
move 1: Nasty Plot
move 2: Psyshock
move 3: Aura Sphere
move 4: Shadow Ball / Fire Blast / Baton Pass
item: Life Orb / Leftovers
nature: Timid
evs: 4 HP / 252 SpA / 252 Spe
Difficult to outright counter due to his wall breaking potential. Chansey gets 2HKOed by +2 Shock, Steels & Houndoom get wrecked by Aura Sphere, and Shadow Ball takes care of opposing psychic types. Fire Blast lets you instantly OHKO Ferroseed, and OHKO Spiritomb at +2. Baton Pass is pretty cool. At the cost of a coverage move, you can BP out of harms way and pass on the boosts to another pokemon. Watch out for CB Spiritomb who can mess Mew up with Sucker Punch of Pursuit and is immune to both Psyshock & Aura Sphere. Houndoom can also check Mew with Sucker Punch.
move 2: Psyshock
move 3: Aura Sphere
move 4: Shadow Ball / Fire Blast / Baton Pass
item: Life Orb / Leftovers
nature: Timid
evs: 4 HP / 252 SpA / 252 Spe
Difficult to outright counter due to his wall breaking potential. Chansey gets 2HKOed by +2 Shock, Steels & Houndoom get wrecked by Aura Sphere, and Shadow Ball takes care of opposing psychic types. Fire Blast lets you instantly OHKO Ferroseed, and OHKO Spiritomb at +2. Baton Pass is pretty cool. At the cost of a coverage move, you can BP out of harms way and pass on the boosts to another pokemon. Watch out for CB Spiritomb who can mess Mew up with Sucker Punch of Pursuit and is immune to both Psyshock & Aura Sphere. Houndoom can also check Mew with Sucker Punch.
move 1: Taunt
move 2: Will-o-Wisp
move 3: Roost
move 4: Psychic / Seismic Toss
item: Leftovers
nature: Bold
evs: 252 HP / 220 Def / 32 Spe
Standard Mew support set. It checks most of the physical sweeper, and is a mean stall breaker due to Will-o-Wisp and a fast taunt. Synchronize dissuades defensive pokemon from using status on Mew. Reliable recovery in roost means that Mew is sticking around, and it does a fair amount of damage with Psychic. Seismic Toss is an option if you want to do deal consistent damage.
move 2: Will-o-Wisp
move 3: Roost
move 4: Psychic / Seismic Toss
item: Leftovers
nature: Bold
evs: 252 HP / 220 Def / 32 Spe
Standard Mew support set. It checks most of the physical sweeper, and is a mean stall breaker due to Will-o-Wisp and a fast taunt. Synchronize dissuades defensive pokemon from using status on Mew. Reliable recovery in roost means that Mew is sticking around, and it does a fair amount of damage with Psychic. Seismic Toss is an option if you want to do deal consistent damage.
move 1: Baton Pass
move 2: Rock Polish
move 3: Swords Dance / Nasty Plot
move 4: Taunt
item: Lum Berry
nature: Bold
evs: 252 HP / 188 Def / 68Spe
Standard Baton Pass set. Mew's extremely bulky, even moreso with screens so taking him down before he passes those boosts won't be easy. Rock Polish lets you get the jump on most of metagame, giving you the ability to Baton Pass out of Pokemon who would otherwise outspeed you. The secondary boosting move is team dependent. Taunt lets you stop defensive Pokemon like Chansey from ruining your Baton pass with status. This set might be broken in UU because it is rather difficult to stop.
move 2: Rock Polish
move 3: Swords Dance / Nasty Plot
move 4: Taunt
item: Lum Berry
nature: Bold
evs: 252 HP / 188 Def / 68Spe
Standard Baton Pass set. Mew's extremely bulky, even moreso with screens so taking him down before he passes those boosts won't be easy. Rock Polish lets you get the jump on most of metagame, giving you the ability to Baton Pass out of Pokemon who would otherwise outspeed you. The secondary boosting move is team dependent. Taunt lets you stop defensive Pokemon like Chansey from ruining your Baton pass with status. This set might be broken in UU because it is rather difficult to stop.
Counters: Mew itself is difficult to counter, because it has different counters depending on the moveset. NP sets typically lose to Spiritomb and are checked by faster hard hitters like Choiced Crookodile & Zoroark. Support variants are wrecked Houndoom. Countering BP is tricky because Mew can Baton Pass at any time. Hybrid Nasty Plot sets w/ Baton Pass are also tricky to deal with. Will Mew end up being to broken for UU? Its possible, stick around to find out.