Amoonguss @ Black Sludge
Ability: Regenerator
EVs: 248 HP / 168 Def / 92 SpD
Bold Nature
- Spore
- Giga Drain
- Clear Smog
- Hidden Power [Fire]

Tornadus-Therian @ Assault Vest
Ability: Regenerator
EVs: 96 HP / 160 SpA / 252 Spe
Hasty Nature
- Hurricane
- Superpower
- U-turn
- Knock Off

Landorus-Therian @ Rocky Helmet
Ability: Intimidate
EVs: 248 HP / 232 Def / 28 SpD
Impish Nature
IVs: 29 Spe
- Stone Edge
- Earthquake
- Stealth Rock
- U-turn

This Lando T set is EVd to take a Latios LO Draco from full and gives a Slow U turn. Def Lando checks stuff like Zard and most phy attackers


Keldeo @ Leftovers
Ability: Justified
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Substitute
- Calm Mind
- Scald
- Secret Sword

Sub CM keld is a slightlty better dark check and I added it as you lack a wincon. Specs Keld is another option if you dont like this. It deals with Heatran and a lot of other stuff and has great synergy with Amoon.

Metagross @ Metagrossite
Ability: Clear Body
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Meteor Mash
- Thunder Punch
- Hammer Arm
- Pursuit/Ice Punch

Pursuit traps Latis, so I personally prefer it.

Latias @ Life Orb
Ability: Levitate
EVs: 72 HP / 184 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Draco Meteor
- Defog/Roost
- Healing Wish
- Psyshock

It gives you a defogger and provides important Healing Wish Support, and this checks Volcanion Keldeo and Zard Y , roost allows this to check them a little better and this is a secondary elec check.