I am not very good at the lower tiers. I made a UU team that is probably not very good:

Mienshao (M) @ Focus Sash
Trait: Regenerator
Shiny: Yes
EVs: 252 Spd / 252 Atk / 4 HP
Jolly Nature
- Hi Jump Kick
- Stone Edge
- U-turn
- Fake Out
Mienshao is a physical sweeper. Fake Out is to deal some free damage. Hi Jump Kick is a very good physical move. Stone Edge is a good coverage move and U-Turn is for switching and healing.

Roserade @ Black Sludge
Trait: Natural Cure
EVs: 252 Spd / 252 Def
Timid Nature
- Toxic Spikes
- Spikes
- Giga Drain
- Hidden Power [Fire]
Roserade is the lead Pokemon. It sets up as many entry hazards as possible, and survive enough to put up the entry hazards. 252 EVs in Defense to raise its poor 55 Defense, and 252 Speed is to do is job as quickly as possible. Giga Drain and HP Fire is just some attacking moves.

Chandelure @ Life Orb
Trait: Flash Fire
EVs: 4 HP / 252 SAtk / 252 Spd
Timid Nature
IVs: 0 Atk
- Fire Blast
- Shadow Ball
- Energy Ball
- Psychic
Chandelure is the special sweeper. It has all special moves that I thought were decent, and a Life Orb to deal more damage.

Snorlax @ Sitrus Berry
Trait: Immunity
EVs: 252 HP / 252 Atk / 4 SDef
Adamant Nature
- Return
- Crunch
- Fire Punch
- Curse
Snorlax is the bulky physical sweeper. Sitrus Berry is to increase longevity. Curse is for boosting.

Cresselia (F) @ Leftovers
Trait: Levitate
EVs: 252 HP / 252 Def / 4 SAtk
Bold Nature
IVs: 0 Atk
- Calm Mind
- Ice Beam
- Psychic
- Substitute
Cresselia is the bulky Pokemon. The plan is to Substitute, Calm Mind behind the Substitute, and actually do some damage. Leftovers is a good item with Substitute.

Darmanitan @ Life Orb
Trait: Sheer Force
EVs: 4 HP / 252 Atk / 252 Spd
Jolly Nature
- Flare Blitz
- Earthquake
- Rock Slide
- Fire Punch
Darmanitan is a fast physical sweeper. Most of its moves are boosted by Sheer Force, so there is no Life Orb recoil. Flare Blitz OHKOs most Pokemon. Fire Punch is for when Flare Blitz is not needed. The other two moves are just coverage moves.

Please rate my team and give me some suggestion for different items, moves, Pokemon and strategy!