Mega Swampert + Tornadus Core Build Help

[Rogue]

Played around with calcs. Made this one.

Swampert-Mega @ Swampertite  
Ability: Swift Swim  
EVs: 116 HP / 132 Atk / 52 Def / 68 SpD / 140 Spe  
Adamant Nature  
- Waterfall  
- Ice Punch  
- Rock Slide  
- Protect

Milestones:
-Lives max spa choice specs draco meteor from Hydreigon.

-3HKO'd by max spa shadow ball from Aegislash.

-Lives Adamant double edge from mega kang + salamence.

-OHKO's Landorut-T in the rain with waterfall (even when intimidated)

-56% chance to OHKO bulky mega mence with Ice Punch.

-OHKO's defensive heatran in the rain.

-Outspeeds adamant max speed scarfed landorus-t.

-3HKO'd by max spa mega gardevoirs psychic and hyper voice.

---

I don't have anything that really works for tornadus, but if you're looking for a speed build:

Tornadus (M) @ Sitrus Berry  
Ability: Prankster  
EVs: 212 HP / 104 Def / 76 SpD / 116 Spe  
Bold Nature  
- Hurricane  
- Taunt  
- Rain Dance  
- Tailwind

I went for bold because even with calm you'll still be getting 2hko'd by electric attacks. at least with this you get 3hko'd by a lot of rock slide users.