Getting the idea from the mono mew team with serperiors potential for any role I made one of these.
Serperior (M) @ Miracle Seed

Trait: Contrary
EVs: 4 HP / 252 SAtk / 252 Spd
Timid Nature (+Spd, -Atk)
- Leaf Storm
- Taunt
- Hidden Power [Fire]
- Giga Drain
Classic serperior lead. Taunts off and beats up other leads.
Serperior (M) @ Focus Sash

Trait: Overgrow
EVs: 4 HP / 252 Atk / 252 Spd
Jolly Nature (+Spd, -SAtk)
- Swords Dance
- Leaf Blade
- Aerial Ace
- Dragon Tail
Physical sweeper. Swords dance gets his attack up then lead blade is STAB, Ariel ace and dragon tail is coverage.
Serperior (M) @ Leftovers

Trait: Overgrow
EVs: 4 HP / 252 Def / 252 SDef
Careful Nature (+SDef, -SAtk)
- Toxic
- Wrap
- Leech Seed
- Protect
Staller. Toxic is is toxic, wrap and leech seed is further stalling and protect protects me.
Serperior (M) @ Leftovers

Trait: Contrary
EVs: 128 Def / 252 SAtk / 128 SDef
Modest Nature (+SAtk, -Atk)
- Leaf Storm
- Giga Drain
- Taunt
- Hidden Power [Fire]
Specail tank. Same moveset as the lead except with EVs in defense
Serperior (M) @ Leftovers

Trait: Overgrow
EVs: 4 HP / 252 Atk / 252 SDef
Adamant Nature (+Atk, -SAtk)
- Coil
- Leaf Blade
- Glare
- Aerial Ace
Physical tank. Same set besides EVs.
Serperior (M) @ Focus Sash

Trait: Overgrow
EVs: 128 Atk / 128 SAtk / 252 Spd
Naive Nature (+Spd, -SDef)
- Calm Mind
- Swords Dance
- Leaf Blade
- Energy Ball
Mixed sweeper (could really use suggestions for him). Calm mind is for boosting sp.atk and swords dance is for his attack. Leaf blade and energy ball is STAB in both categories.