Mega Latias + Suicune Semi-Stall

Latias-Mega @ Latiasite
Ability: Levitate
EVs: 248 HP / 8 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Calm Mind
- Stored Power
- Dragon Pulse
- Recover

Suicune @ Leftovers
Ability: Pressure
Shiny: Yes
EVs: 248 HP / 244 Def / 16 Spe
Bold Nature
IVs: 0 Atk
- Calm Mind
- Rest
- Roar
- Scald

Gliscor @ Toxic Orb
Ability: Poison Heal
EVs: 244 HP / 8 Def / 200 SpD / 56 Spe
Careful Nature
- Earthquake
- Knock Off
- Swords Dance
- Roost

Zapdos @ Leftovers
Ability: Pressure
EVs: 248 HP / 176 Def / 68 SpA / 16 Spe
Bold Nature
- Thunderbolt
- Roost
- Defog
- Heat Wave

Clefable @ Leftovers
Ability: Magic Guard
EVs: 252 HP / 172 Def / 84 SpD
Calm Nature
IVs: 0 Atk / 6 Spe
- Calm Mind
- Soft-Boiled
- Thunder Wave
- Moonblast

Ferrothorn @ Chople Berry
Ability: Iron Barbs
EVs: 252 HP / 88 Def / 168 SpD
Relaxed Nature
- Leech Seed
- Stealth Rock
- Power Whip
- Protect