What is a good Battle Facility team for Generation 6?

Question

Share your best competitive teams for Generation 6’s battle facilities on this thread! Your team should be made to beat any of the battle facilities as efficiently as possible.

The Battle facilities in Generation 6 is/are:
Battle Institute - Pokemon X/Y/Omega Ruby/Alpha Sapphire
Battle Maison - Pokemon X/Y/Omega Ruby/Alpha Sapphire

Before submitting your team, please read the following guidelines and make adjustments where they fit.

• Make sure you show in your answer which facility this team is for battling in.

• Include your recommended Pokemon in your answer, each with recommended moves for use in the Battle Facility.

• Remember that players may be unable to access certain Pokemon, such as those restricted by version exclusivity or trade evolutions. If you'd like to suggest a Pokemon like this, please mention alternative/s.

• Please post original teams. Do not post teams made by other people, such as Youtubers.

• Provide explanation and detail. Justify your Pokemon and moveset choices; possible discussion points include ease-of-use, team synergy and coverage for key battles.

• Submit your team as an answer, not a comment. To keep things tidy, we will remove any teams posted as comments in this thread. If you simply want to update your post, use the 'edit' button.

Answer 1

This is for the Battle Institute, for singles, as I can't really do doubles without hidden abilities :(.

So, without any delay, let us start :) Oh fine, one more delay. I will be composing my team of a mixed tank, a specially offensive Pokemon, and a physically offensive Pokemon.

First, for my mixedish tank, Clefable.

Clefable @ Leftovers
Ability: Any ability works, Magic Guard is preferred
EVs: 252 HP/252 Def/4 SpDef
Bold Nature
- Stealth Rock (If you have access to the move tutor)/Ice Beam
- Calm Mind
- Moonblast
- Soft Boiled (If you can transfer it from a gen 3 game)/Flamethrower

Charizard @ Charizardite-Y
Ability: Drought
EVs: 252 SpAtk/4 SpDef/252 Spe
Timid Nature
- Flamethrower
- Solar Beam
- Tailwind
- Roost

Azumarill @ Life Orb
Ability: Huge Power
EVs: 252 Atk/4 Def/252 Spe
Adamant Nature
- Superpower
- Play Rough
- Knock Off
- Waterfall/Aqua Jet (If you can get the egg move lol)