SM OU Help with M-Medicham balance

[Snaky]

The idea of this team is for Medicham and Tapu Koko to beat down my opponent. I gave them a defensive backbone in the form of a fire, water, grass core consisting of phy def Tapu Fini, mixed wall Ferrothorn and max hp Heatran. I added choice scarf Landorus to the team to check Mega-Alakazam, Volcarona and Greninja.

I feel like I could give the defensive mons better spreads and sets to compliment each other, but I can't seem to think of any fitting changes.

It would be very much appreciated if you could help me improve this team!

Medicham-Mega @ Medichamite
Ability: Pure Power
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- High Jump Kick
- Zen Headbutt
- Ice Punch
- Fake Out

Tapu Koko @ Choice Specs
Ability: Electric Surge
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Thunderbolt
- Volt Switch
- Hidden Power [Ice]
- Dazzling Gleam

Ferrothorn @ Leftovers
Ability: Iron Barbs
EVs: 252 HP / 92 Def / 164 SpD
Sassy Nature
IVs: 0 Spe
- Spikes
- Leech Seed
- Power Whip
- Gyro Ball

Tapu Fini @ Leftovers
Ability: Misty Surge
EVs: 252 HP / 252 Def / 4 Spe
Bold Nature
IVs: 0 Atk
- Taunt
- Nature's Madness
- Moonblast
- Defog

Heatran @ Leftovers
Ability: Flash Fire
EVs: 252 HP / 4 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Stealth Rock
- Magma Storm
- Taunt
- Earth Power

Landorus-Therian @ Choice Scarf
Ability: Intimidate
EVs: 80 HP / 148 Atk / 84 Def / 196 Spe
Naive Nature
- Defog
- Earthquake
- Hidden Power [Ice]
- U-turn

 

[Gross Sweep]

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