Rate my OU team

Question

Scizor-Mega @ Scizorite
Ability: Technician
EVs: 252 Def / 252 Spe
Impish Nature
- Bullet Punch
- Swords Dance
- Roost
- U-turn

Greninja-Ash @ Choice Specs
Ability: Battle Bond
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Water Shuriken
- Dark Pulse
- Hydro Pump
- U-turn

Tapu Koko @ Life Orb
Ability: Electric Surge
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Volt Switch
- U-turn
- Dazzling Gleam
- Thunderbolt

Tapu Fini @ Leftovers
Ability: Misty Surge
EVs: 64 SpD
Timid Nature
IVs: 0 Atk
- Taunt
- Defog
- Moonblast
- Surf

Mamoswine @ Focus Sash
Ability: Oblivious
EVs: 252 Atk / 252 Spe
Jolly Nature
- Stealth Rock
- Ice Shard
- Earthquake
- Icicle Crash

Machamp @ Flame Orb
Ability: Guts
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Close Combat
- Earthquake
- Fire Punch
- Knock Off

Comments

3 minor things:
4 unused EVs on Scizor
a lot of unused EVs on Tapu Fini
4 unused EVs on Mamoswine

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Why are you using Machamp over Conkeldurr? Your Machamp isn't going to outspeed anything with base 55 speed. By the way, why are you using fire punch over bullet punch?

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The unused evs I have allotted, Tapu Fini has 192 Def and 252 HP but I forgot to put them. Scizor's 4 Evs are in atk and Mamoswine's in Sp. Def. I am using Machamp over Conckeldurr because Machamp's slightly higher speed has saved some of my matches. Also, Fire punch is the only fire type move I have and I already have priority with Scizor and Greninja

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You also don't have any rock attacks on your team. I think stone edge would be better than fire punch because it covers bug and flying.

Answer 1

Mega-Scizor:
No problems.

Greninja-Ash:
It looks fine.

Tapu Koko
Tapu Koko would function much better as an offensive pivot. Keep the U-turn and Volt Switch, but replace your Life Orb with a Magnet. This way, Thunderbolt hits even harder and you don't have to waste your HP. Tapu Koko is also much too frail to switch in on most things, so save it for revenge killing.

Tapu Fini
Tapu Fini is actually an excellent Defogger. A better set would maybe be a defensive Tapu Fini, with a Calm Nature and Taunt, Nature's Madness, Moonblast, and Defog. This would allow it to shut down many leads, such as Chansey and Skarmory, who rely on status and entry hazards.

Mamoswine
Mamoswine is a decent wallbreaker, but I would recommend Thick Fat over Oblivious, as Taunt has no effect anyway.
However, if you want a better wallbreaker, I recommend this set:
Pheromosa @ Focus Sash
Ability: Beast Boost
EVs: 224 SpA / 32 SpD / 252 Spe
Modest Nature
- Quiver Dance
- Bug Buzz
- Focus Blast
- Ice Beam

Machamp
Machamp is in RU. Rarely Used. That's two tiers below OU. Why would you use Machamp? Almost any pokemon would be better than Machamp. You could use Landorus-Therian, for example.
Landorus-Therian @ Life Orb
Ability: Intimidate
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature
- Earthquake
- Swords Dance
- Stone Edge
- Stealth Rock

Comments

Most of this answer is good, but I just wanted to point out that life orb powers up all moves by 13/10 times, or 1.3 times. Magnet powers up only electric moves, and powers them up by 6/5 times, or 1.2 times. Thunderbolt would not hit harder with a magnet.

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Yes, Life orb boosts moves x1.33 and also, I prefer to have Mamoswine over Landorus as my stealth rocker because it can also take down other Landorus and I prefer Machamp's bulkiness over Pheromosa because I already have Ash Greninja which is about as fragile as Pheromosa. Pheromosa is really fragile and having both Pheromosa and Ash greninja in the same team wouldn't be smart in my opinion. As for Tapu Fini, this set offers a balanced defense and special defense stat and is faster than opposing Tapu Finis. This my personal opinion but I could see your suggestions working really well in most cases too. Thanks for sharing your opinion!