Cobalion @ Fightinium Z
Ability: Justified
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Calm Mind
- Focus Blast
- Flash Cannon
- Hidden Power [Ice]

Venusaur @ Venusaurite
Ability: Chlorophyll
EVs: 248 HP / 192 Def / 68 SpD
Bold Nature
IVs: 0 Atk
- Leech Seed
- Synthesis
- Hidden Power [Fire]
- Sludge Bomb

Landorus-Therian @ Leftovers
Ability: Intimidate
EVs: 252 HP / 216 Def / 20 SpD / 20 Spe
Impish Nature
- Stealth Rock
- Earthquake
- Hidden Power [Ice]
- U-turn

Azumarill @ Choice Band
Ability: Huge Power
EVs: 92 HP / 252 Atk / 164 Spe
Adamant Nature
- Play Rough
- Aqua Jet
- Waterfall
- Knock Off

Medicham @ Choice Scarf
Ability: Pure Power
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- High Jump Kick
- Zen Headbutt
- Ice Punch
- Thunder Punch

Empoleon @ Shuca Berry
Ability: Torrent
EVs: 252 HP / 4 Def / 252 SpD
Calm Nature
- Scald
- Defog
- Knock Off
- Toxic

This team's been a lot of fun and has been doing pretty well for me, but it struggles to break things like Toxapex and Mew. Maybe you could pimp it up a little :]
Preferable Cobalion stays on the team, but feel free to change up the set. Everything else is up to you