OU RMT/Help?

[PD83]

Currently, my team is:

1.) Thundurus
Atk: 76/SpA: 180/Spe: 252
Nature: Naive
Ability: Prankster
Item: Life Orb
Moves:
- Thunder Wave
- Knock Off
- Thunderbolt
- Hidden Power Ice

2.) Sylveon
HP: 252/SpA: 4/SpD: 252
Nature: Calm
Ability: Pixilate
Item: Leftovers
Moves:
- Hyper Voice
- Protect
- Heal Bell
- Wish
(Admittedly, I'd prefer more SpA power)

3.) Mega-Tyranitar
HP: 252/Def: 116/SpD: 140
Nature: Impish
Ability: Sand Stream
Item: Tyranitarite
Moves:
- Dragon Dance
- Stone Edge
- Earthquake
- Ice Punch

4.) Dusclops
HP: 4/Def: 252/SpD: 252
Nature: Calm
Ability: Frisk
Item: Eviolite
Moves:
- Will o' Wisp
- Substitute
- Pain Split
- Night Shade

I've been having good pretty good experience with these Pokemon, but what else should I add/modify for the current team? Thanks.

EDIT: I'm thinking something that can Dual Screen and take hits, but who can do that?