is this a good team for OU?

Question

Serperior (F) @ Leftovers
Ability: Contrary
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Hidden Power [Rock]
- Leech Seed
- Leaf Storm
- Substitute

Lopunny-Mega (F) @ Lopunnite
Ability: Scrappy
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Fake Out
- Return
- Jump Kick
- Ice Punch

Jolteon @ Focus Sash
Ability: Volt Absorb
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Thunderbolt
- Thunder Wave
- Shadow Ball
- Hidden Power [Ice]

Mimikyu (F) @ Leftovers
Ability: Disguise
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Play Rough
- Swords Dance
- Wood Hammer
- Shadow Sneak

Chansey (F) @ Eviolite
Ability: Natural Cure
EVs: 252 HP / 4 Def / 252 SpD
Calm Nature
- Wish
- Soft-Boiled
- Heal Bell
- Seismic Toss

Skarmory @ Leftovers
Ability: Sturdy
EVs: 252 HP / 232 Def / 24 Spe
Impish Nature
- Spikes
- Defog
- Stealth Rock
- Tailwind

any suggestions are changes i should make?

Comments

Replace Serperior and Jolteon with Kartana for better stats and Zapdos for better movepool. Give Mimikyu a life orb for more power and replace its wood hammer with shadow claw to for less resistances. Give Chansey 252 HP/252 Def/4 SpD bold to take physical attacks better. Replace its wish with stealth rock to lay hazards. Replace Skarmory's stealth rock and tailwind with roost to heal and brave bird for hitting grass Pokemon and taunt users.