Please rate my Gen 7 Uber Team!

Question

Groudon-Primal @ Red Orb
Ability: Desolate Land
EVs: 252 HP / 0 Atk / 56 Def / 0 SpA / 200 SpD / 0 Spe
Impish Nature
- Precipice Blades
- Stone Edge
- Rock Polish
- Swords Dance

Necrozma-Dusk-Mane @ Ultranecrozium Z
Ability: Prism Armor
EVs: 252 HP / 4 Atk / 0 Def / 0 SpA / 252 SpD / 0 Spe
Careful Nature
- Sunsteel Strike
- Earthquake
- Swords Dance
- Photon Geyser

Yveltal @ Choice Scarf
Ability: Dark Aura
EVs: 0 HP / 0 Atk / 0 Def / 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Oblivion Wing
- Dark Pulse
- Foul Play
- U-turn

Arceus-Ground @ Earth Plate
Ability: Multitype
EVs: 252 HP / 0 Atk / 64 Def / 0 SpA / 0 SpD / 192 Spe
Timid Nature
- Recover
- Judgment
- Ice Beam
- Defog

Xerneas @ Power Herb
Ability: Fairy Aura
EVs: 0 HP / 0 Atk / 168 Def / 252 SpA / 0 SpD / 88 Spe
Modest Nature
- Moonblast
- Geomancy
- Thunder
- Aromatherapy

Marshadow @ Choice Band
Ability: Technician
EVs: 0 HP / 252 Atk / 0 Def / 0 SpA / 4 SpD / 252 Spe
Jolly Nature
- Spectral Thief
- Shadow Sneak
- Close Combat
- Rock Tomb

Comments

You can use Impish instead of Relaxed on Groudon; also, Double Dancer Don needs a second move instead of Stealth Rock to be effective. :P

Sucker Punch doesn't have much Merit for Scarfed Yveltal; a coverage move would be better. :P

Marshadow isn't great with a Focus Sash; a Life Orb or Choice Band will guarantee more KOs and is more re-usable. :P

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Use marshadium z

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Using two Z-Crystals is ill advised on a team, especially since they're using Ultra Necrozma.

Also, the lack of speed investment on Necrozma is concerning since it's liable to getting outsped by a lot of threats in the meta after Ultra Burst. Perhaps it might be better to run a different item on it?
Choice Band is fine but I personally prefer Life Orb to prevent Marshadow from being locked to a move on a threat it can't hit.

Those are just my thoughts

Answer 1

I prefer Arceus-Normal because it gets Extreme Speed STAB. Shadow Claw for Ghost types that Extreme Speed can't hit. This set for Arceus has pulled me through in tight pinches because of Extreme Speed's priority.

Arceus-Normal @ Mago Berry
Ability: Multitype
EVs: 252 Atk / 252 Spe / 4 HP
Jolly Nature
- ExtremeSpeed
- Shadow Claw
- Recover
- Swords Dance

Groudon-Primal Is #1 in Ubers, though I think I use it differently than everyone else. I chose Earthquake(100 Accuracy) over Precipice Blades(85 Accuracy) because of Accuracy. I have been screwed over many times, and I prefer Accuracy every time. But, if you want power, Groudon get's access to Hone Claws. Thunder Punch for the 4x weakness to Water(though Fire Punch is STAB, and Iron Head for Xerneas's Geomancy sweep.

Groudon-Primal @ Red Orb
Ability: Desolate Land
EVs: 252 Spe / 252 Atk / 4 HP
Adamant Nature
- Earthquake/Precipice Blades
- Thunder Punch/Fire Punch
- Iron Head
- Swords Dance/Hone Claws

Comments

A super effective iron head is weaker than a neutrally effective precipice blades and only 1/15 stronger than a neutrally effective earthquake. It's usually useless and should probably be replaced with stealth rock or rock polish.