Gen 6 Ubers team advice

[Nicky g]

I'm new to making competitive teams in general so I was wondering if I could get some advice on my ubers team I just made.

Heracross @ Heracronite
Ability: Swarm
EVs: 248 HP / 252 Atk / 8 SpD
Adamant Nature
- Close Combat
- Megahorn
- Rock Blast
- Sleep Talk

Mewtwo-Mega-Y @ Mewtwonite Y
Ability: Insomnia
Shiny: Yes
EVs: 248 HP / 252 Atk / 8 SpA
Lonely Nature
- Psystrike
- Drain Punch
- Ice Beam
- Calm Mind

Rayquaza @ Lum Berry
Ability: Air Lock
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- V-create
- Extreme Speed
- Dragon Ascent
- Dragon Dance

Groudon @ Red Orb
Ability: Drought
Shiny: Yes
EVs: 252 Atk / 4 SpA / 252 Spe
Naughty Nature
- Stealth Rock
- Lava Plume
- Earthquake
- Dragon Tail

Darkrai @ Leftovers
Ability: Bad Dreams
EVs: 248 Atk / 4 SpA / 252 Spe
Timid Nature
- Dark Void
- Dream Eater
- Shadow Ball
- Dark Pulse

Xerneas @ Power Herb
Ability: Fairy Aura
Shiny: Yes
EVs: 248 Atk / 4 SpA / 252 Spe
Modest Nature
- Moonblast
- Thunder
- Hidden Power [Ground]
- Geomancy

The heracross is my counter to darkrais and a bit for flying types at the moment.

 

[Asmodean]

You have two megas and Heracross doesn't check flying types. You might also want to get approval from a mod before posting a thread.

 

[Sweep]

I'm done with people with no prior posts to their name making awful RMT threads in the wrong forum. Look, maybe you're the next Hack but for now, please consult the FAQ (simple questions, simple answers) thread for random questions or team advice.

These threads will be infracted starting now. (ninjacat)(beer) please for the love of God start lurking before you post, and I do want you to eventually contribute to this community but this is absurd