Ubers BW2 Team

I've been playing Ubers quite a lot recently, mainly with this team. I just want to see if it could have any improvements made to it. All suggestions welcome!

Groudon @ Leftovers
Trait: Drought
EVs: 252 HP / 4 Def / 252 SDef
Careful Nature (+SDef, -SAtk)
- Thunder Wave
- Stealth Rock
- Dragon Tail
- Earthquake

Hitmontop (M) @ Leftovers
Trait: Technician
EVs: 252 HP / 80 Def / 176 SDef
Impish Nature (+Def, -SAtk)
- Rapid Spin
- Toxic
- Fake Out
- Mach Punch

Forretress (F) @ Shed Shell
Trait: Sturdy
EVs: 252 HP / 4 Def / 252 SDef
Sassy Nature (+SDef, -Spd)
- Toxic Spikes
- Spikes
- Gyro Ball
- Explosion

Venusaur (M) @ Expert Belt
Trait: Chlorophyll
EVs: 116 Atk / 140 SAtk / 252 Spd
Naughty Nature (+Atk, -SDef)
- Growth
- Seed Bomb
- Sludge Bomb
- Sleep Powder

Kyurem (Kyurem-W) @ Choice Scarf
Trait: Turboblaze
EVs: 4 HP / 252 SAtk / 252 Spd
Timid Nature (+Spd, -Atk)
- Ice Beam
- Draco Meteor
- Fusion Flare
- Earth Power

Ho-Oh @ Choice Band
Trait: Regenerator
EVs: 4 HP / 252 Atk / 252 Spd
Jolly Nature
- Sacred Fire
- Brave Bird
- Earthquake
- Return

I was thinking about changing Ho-Oh anyway, because two choice items is overkill. Thanks in advance!

[King of Lucario]

How well has this been doing exactly? I can't imagine it doing particularly well at all against anyone good since it doesn't really pay much regard to any of the big threats in Ubers (Kyogre, Arceus etc.) Also, you have a Sun team in Ubers without Reshiram why exactly?

Hitmontop seems a bit sketchy here since it's not exactly the best defender in the world in a tier where half the enemies have Base 150 offenses on average, not to mention Psychic is quite a prevalent type in Ubers thanks to Mewtwo, Lugia, Latios and Deoxys.

There's no point using Forretress in Ubers if you aren't using Rapid Spin on it. You're better off using Ferrothorn instead since it fights off Kyogre and Palkia much better.

I'd take a closer look at that tier and make something a bit more solid if I were you. You can make a lot more from Ubers than this.