My 6th gen Ubers team [The Celestial Powers]

Question

Hi, this is one of my first and most loyal teams. I wanted some expertise on it so I came here.
I also took the liberty of making it into showdown form for you people that enjoy that.

Behemoth (Dialga) @ Leftovers
Ability: Pressure
EVs: 252 Def / 252 HP / 4 Atk
Lax Nature
- Earthquake
- Stealth Rock
- Thunder Wave
- Flash Cannon

As you will see, this team has nothing against fairy types. Nothing. Besides, it looks pretty cool.

Socrate's (Blaziken) @ Blazikenite
Ability: Speed Boost
EVs: 252 Spd / 252 Atk / 4 SDef
Adamant Nature
- Swords Dance
- High Jump Kick
- Flare Blitz
- Protect

This is a pretty standard set for Blaziken. I just mega-volved it and (poof) it's wrecking face more than ususal.

Foreshadow (Darkrai) @ Life Orb
Ability: Bad Dreams
Shiny: Yes
EVs: 252 Spd / 252 SAtk / 4 SDef
Timid Nature
- Dark Void
- Dark Pulse
- Dream Eater
- Nightmare

Any explanation needed?

Benusila (Deoxys-Attack) @ Focus Sash
Ability: Pressure
Shiny: Yes
EVs: 252 Spd / 252 SAtk / 4 Atk
Naive Nature
- Psycho Boost
- Dark Pulse
- Hidden Power [Fire]
- Extreme Speed

This beast is pretty frail, yes, but it can deal damage like it's no one's business. Great revenge killer and endgame cleaner

Höyük (Xerneas) @ Power Herb
Ability: Fairy Aura
Shiny: Yes
EVs: 176 HP / 252 SAtk
- Geomancy
- Moonblast
- Hidden Power [Fire]
- Psyshock

This thing can make your blood boil at first glance. We have weaponized the bringer of life and happiness, and this time it won't be stopped by a some 10 year olds. Epic tank and sweeper.

Sleipnir (Arceus-Poison) @ Toxic Plate
Ability: Multitype
EVs: 252 SAtk / 252 HP / 4 Atk
Mild Nature
- Flamethrower
- Ice Beam
- Thunder
- Aqua Tail

shrugs shoulders It's purple.

Showdown form:

Behemoth (Dialga) @ Leftovers
Ability: Pressure
EVs: 252 Def / 252 HP / 4 Atk
Lax Nature
- Earthquake
- Stealth Rock
- Thunder Wave
- Flash Cannon

Foreshadow (Darkrai) @ Life Orb
Ability: Bad Dreams
Shiny: Yes
EVs: 252 Spd / 252 SAtk / 4 SDef
Timid Nature
- Dark Void
- Dark Pulse
- Dream Eater
- Nightmare

Benusila (Deoxys-Attack) @ Focus Sash
Ability: Pressure
Shiny: Yes
EVs: 252 Spd / 252 SAtk / 4 Atk
Naive Nature
- Psycho Boost
- Dark Pulse
- Hidden Power [Fire]
- Extreme Speed

Socrate's (Blaziken) @ Blazikenite
Ability: Speed Boost
EVs: 252 Spd / 252 Atk / 4 SDef
Adamant Nature
- Swords Dance
- High Jump Kick
- Flare Blitz
- Protect

Höyük (Xerneas) @ Power Herb
Ability: Fairy Aura
Shiny: Yes
EVs: 176 HP / 252 SAtk
- Geomancy
- Moonblast
- Hidden Power [Fire]
- Psyshock

Sleipnir (Arceus-Poison) @ Toxic Plate
Ability: Multitype
EVs: 252 SAtk / 252 HP / 4 Atk
Mild Nature
- Flamethrower
- Ice Beam
- Thunder
- Aqua Tail

Comments

If you built an u ers team around "cool-looking" pokemon your mind will explode trying to discriminate what pokemon looks cooler than the other.

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Since you say it's Ubers, I'm assuming you're playing on Smogon tiers.
1. Sleep Clause means you can only put one opponent to sleep, so I would take out the sleep focused Dream Eater and Nightmare in favor of coverage moves. The moveset suggested below by Omiestime is good, but I will suggest replacing Taunt with one of Nasty Plot or Ice Beam.
2. Your Arceus is weird. Aqua Tail -> Judgment. Because the point is to destroy opposing Xerneas.
3. Also, your Xerneas is massively lacking in EV's for some reason.

Answer 1

Your Arceus really needs something besides Toxic Plate if you're only using it due to its color. Try Judgement instead of Thunder, since it has poor accuracy outside of rain anyways. And you mentioned you have nothing for Fairies so a Poison Judgement will hit those hard.

As for Darkfrai, that moveset looks good on paper. But imagine you miss your Dark Void or someone is using a Lum Berry. It's a gimmick at best. I would run

Darkrai @ Life Orb
Timid Nature
4HP/ 252 Sp. Atk/ 252 Spd
-Dark Void
-Focus Blast
-Dark Pulse
-Taunt

Nuetral coverage for everything except Fairy types, which Darkrai shouldn't be trying to take head on anyways.