RMT: Looking for a MegaEvolution to balence my team

Question

Hey guys I'm looking for a mega to balance my team, and I'm having a hard time deciding so I'm hoping to get some suggestions out there. I'm open to all suggestions. So here's what I have so far:
Weavile@Choice Scarf
Ability: Pressure
Evs: 252 Atk, 4 Def, 252 Spd
Moves:
Ice Punch
Night Slash
Brick Break
Aeriel Ace

Shuckle@ Chesto Berry
Ability: Contrary
Evs: 4 Hp, 252 Def, 252 SpDef
Moves:
Shell Smash
Rest
Toxic
Power Split

Goodra@ Life Orb
Ability: Sap Sipper
Evs: 4 Hp 252 Atk, 252 Spd
Moves:
Earthquake
Outrage
Power Whip
Rock Slide

Aggron@Left Overs
Ability: Sturdy
Evs: 4 Hp, 252Def, 252 SpDef
Moves:
Metal Burst
Automatize
Earthquake
Ice Punch

So feel free to give an suggestions and just leave It in the comments, thank you.

Comments

Well I cant help but notice that 2 of your pokemon are 4 times weak to fighting and none are actually pretty strong against it.
Try mega gardevoir
It should fit into your team perfectly. Fighting types won't be a problem at all and you will be covering loads of other types like dark.
Moveset is your choice.
And why the hell does shuckle have double team. If its ability is contrary wouldn't that decrease his evasiveness? Why would you want to do that?

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Wow I never thought about that mega thanks alot man. And about the double team, that was a typo sorry :)

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Why can't u just do mega aggron that doesn't make any sense dude u already should have 2 mega :/

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I rather go with the one-shot metal burst then waste the mega spot