ORAS OU help me pick my last pokemon

[ChowPong]

This is my team all pretty self explanatory, aside from Azelf he is my lead usually nasty plot then just try to do as much damage as quickly as possible.. I need one more Pokemon to complete this team and I cannot decide I have tried a variety but want your opinions :). Preferably a mega as I don't currently have one in this team.

Dragonite (M) @ Leftovers
Ability: Multiscale
Shiny: Yes
EVs: 216 HP / 64 Atk / 228 SpD
Adamant Nature
- Earthquake
- Dragon Claw
- Extreme Speed
- Dragon Dance

for easy sweeps helps me get lots of quick games e speed so i kan kill pokemon with priority and to kill pokemon before i set up

Latios @ Life Orb
Ability: Levitate
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Draco Meteor
- Psyshock
- Ice Beam
- Hidden Power [Fire]

no one ever expects this set it is one of my favourite sets by far ice beam to get dragon pokemon so i dont have to worry about draco miss

Azelf @ Focus Sash
Ability: Levitate
Shiny: Yes
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Nasty Plot
- Psychic
- Flamethrower
- Thunderbolt

suicide lead nuf said

Scizor @ Leftovers
Ability: Technician
EVs: 248 HP / 44 Atk / 16 Def / 200 SpD
Impish Nature
- Swords Dance
- Roost
- Bullet Punch
- Knock Off

to counter my huge weakness to ice and fairy by setting up with sd then killing pokemon like clefairy and kyurem-b

Azumarill @ Sitrus Berry
Ability: Huge Power
EVs: 92 HP / 252 Atk / 164 Spe
Adamant Nature
- Belly Drum
- Aqua Jet
- Play Rough
- Knock Off

finally azu here to clean pp against teams after my other pokemonkill everything else

 

[mrdark0121]

i think ur last mon should be sawsbuck it abusses opposing weather and beats tar with high jump kik, i think it outspeeds keldio and beats it
but thats just my 2 cents, the team made perfect sence. goodluck