SM OU I'm trying to make a viable laddering team

[Br1ght]

This team works pretty well until i reached 1400 point thingy

Medicham-Mega @ Medichamite
Ability: Pure Power
Happiness: 0
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- High Jump Kick
- Zen Headbutt
- Ice Punch
- Fake Out
I wanted to use Mawile as a wallbreaker but i think my team will be too slow and a bit weaker to Lando

Porygon-Z @ Normalium Z
Ability: Adaptability
EVs: 120 HP / 252 SpA / 136 Spe
Modest Nature
IVs: 0 Atk
- Shadow Ball
- Discharge
- Recover
- Conversion
Works well as a setup sweeper in lower tier

Celesteela @ Leftovers
Ability: Beast Boost
EVs: 252 HP / 4 Def / 252 SpD
Calm Nature
IVs: 0 Atk
- Leech Seed
- Air Slash
- Flamethrower
- Protect
Special Wall

Landorus-Therian @ Rocky Helmet
Ability: Intimidate
EVs: 252 HP / 252 Def / 4 SpD
Impish Nature
- Knock Off
- U-turn
- Stealth Rock
- Earthquake
Physical Wall

Greninja @ Choice Scarf
Ability: Protean
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Dark Pulse
- Extrasensory
- Ice Beam
- Surf
Revenge Killer

Marowak-Alola @ Thick Club
Ability: Lightning Rod
EVs: 156 HP / 252 Atk / 100 SpD
Adamant Nature
- Bonemerang
- Fire Punch
- Shadow Bone
- Swords Dance
Usually capable of taking one or two hits and knock out a pokemon.
im using lightning rod because i think i need 1 more electric switch in


I just dont know if i can reach higher ladder with this
have been dropping to 1300
I wanted to put defog on something but i dont know what

 

[IronBullet]

Welcome to Smogon! I'm locking your RMT for the time being as your descriptions are lacking and not up to the standard required by the forum rules. You need to provide in-depth descriptions for each Pokemon to explain their roles. Please read the rules carefully and take a look at RMTs in Team Showcase to see the level of detail we require. PM me with updated descriptions and I'll be happy to unlock this.