Hey /vp/ I'm currently making a competitive team and would appreciate some advice with how to finish it off.

Greninja @ Expert Belt
Ability: Protean
EVs: 252 Spd / 252 SAtk / 4 Atk
Hasty Nature
- Dark Pulse
- Surf
- Ice Beam
- U-turn

Blaziken @Air Balloon or Focus Sash or Leftovers
Ability: Speed Boost
Ev's 252 Atk / 252 Spd / 4 Hp
Adamant Nature
- Hone Claws
- Blaze Kick
- Hi Jump Kick
- Earthquake

Tyranitar @ Leftovers
Ability: Sand Stream
EVs: 252 HP / 4 Atk / 252 SDef
Sassy/Calm Nature
-Stealth Rock
- Fire Blast
- Pursuit
- Stone Edge

Metagross @ Leftovers?
Ability: Clear Body
EVs: 252 HP / 252 Def / 4 Atk
Impish Nature
- ???
- ???
- ???
- ???

Gengar @ Shadow Tag/ Gengarite ?
Ability: Levitate
EVs: 252 SpAtk / 252 Spd / 4 HP
Timid Nature
- Substitute
- Focus Blast
- Shadow Ball
- Sludge Bomb

I also need help figuring out what my last pokemon should be and it's role