K, lets begin this nu madness.
Ditto
Imposter is a must on ditto however, in my opinion focus sash isn't the best item for it also ev's and iv's don't matter since it will transform. so here's what i would do.
Ditto @ Leftovers
Ability: Imposter
EVs: 248 HP / 252 Def / 8 SpD
Bold Nature
- Transform
Use|Steal the power of one of their pokemon or disrupt their team.
Pros| You can disturb their team, you can take the power of their mega.
Cons| Its a risk since you could transform into a bad Pokemon.
Tips|Transform into their mega or another powerhouse.
Kecleon
protean makes for large coverage and power up punch can boost attack meaning it can deal a lot of damage so here it is.
Kecleon @ Lum Berry
Ability: Protean
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Power-Up Punch
- Shadow Sneak
- Knock Off
- Fire Punch
Use|To cause serious damage to the opponent and weaken there team with huge coverage. with defense against burn.
Pros|Large coverage, always stab, can deal decent damage, can take a decent hit.
Cons|Being burnt multiple times, tanky pokemon, faster sweepers.
tips|Set up with power up punch.
Rhydon
I must ask, why assault vest and not eviolite? eviolite is much better. It is a good attacker but the ev's could be improved.
Rhydon @ Eviolite
Ability: Rock Head
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Double-Edge
- Swords Dance
- Fire Punch
- Stone Edge
Use|To tank hits and deal big hits back.
Pros|Has large attack, good defense with eviolite, doesn't take recoil.
Cons|Knock off, water, grass.
Tips|Stay away from water and grass, set up.
Tauros
I must say you did good with this one, the item complements the ability, nature, ev's and moves very well and there would be no better choice.
Tauros (M) @ Life Orb
Ability: Sheer Force
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Return
- Rock Slide
- Zen Headbutt
- Iron Head
Use|To sweep the opponents team.
Pros|Great attack, fast, good move pool.
Cons|fighting types, steel types.
Tips|Use return as a last resort if other moves are not very effective.
Quagsire
Quagsire is a great pokemon and with unaware and those ev's, its a beastly tank that can stall all day.
Quagsire @ Leftovers
Ability: Unaware
EVs: 252 HP / 252 Def / 4 SpD
Calm Nature
- Scald
- Stockpile
- Toxic
- Recover
Use|A staller
Pros|Good bulk, can burn or toxic, recover, stockpile.
Cons|Grass, taunt.
Tips| set up, go for toxic first then start scalding\recovering\stockpiling.
Electivire
Expert belt is great since it is super effective against 624 pokemon with that move set. You can also swap into a electric move with motor drive to help sweep.
Electivire @ Expert Belt
Ability: Motor Drive
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature
- Cross Chop
- Wild Charge
- Ice Punch
- Earthquake
Use| Sweeper.
Pros|Huge coverage, good speed for its tier, good power.
Cons|Wild charge recoil, burn.
Tips|Just attack.
Overall its a good nu team.