Since Gemoancy is banned in Uber tournaments, this is my Uber team. Please give any advice.

Groudon @ Red Orb
Ability: Drought
Shiny: Yes
EVs: 168 HP / 240 Atk / 36 SpD / 64 Spe
Adamant Nature
- Rock Polish
- Precipice Blades
- Swords Dance
- Stone Edge

Xerneas @ Power Herb
Ability: Fairy Aura
Shiny: Yes
EVs: 72 HP / 252 SpA / 100 SpD / 84 Spe
Modest Nature
IVs: 0 Atk
- Geomancy
- Moonblast
- Hidden Power [Rock]
- Aromatherapy

Gengar (M) @ Gengarite
Ability: Cursed Body
Shiny: Yes
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Taunt
- Destiny Bond
- Focus Blast
- Shadow Ball

Yveltal @ Leftovers
Ability: Dark Aura
Shiny: Yes
EVs: 248 HP / 252 Def / 8 SpD
Bold Nature
IVs: 0 Atk
- Foul Play
- Roost
- Taunt
- Toxic

Arceus-Ground @ Groundium Z
Ability: Multitype
Shiny: Yes
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Swords Dance
- Earthquake
- Stone Edge
- Recover

Jirachi @ Leftovers
Ability: Serene Grace
EVs: 4 HP / 252 Def / 252 SpD
Impish Nature
- Cosmic Power
- Rest
- Iron Head
- Heart Stamp