So I wanted to do an interesting OU team. One that would utilize Pokémon maybe not used so much in the OU tier and two to play mind tricks on my opponent. And that's to have a team entirely centered around only Pokémon who can mega evolve(excluding those whose megas were banned to Uber.)
Now it could use a little help. If you notice any holes that maybe I missed then I would love to hear your input. Anyhow. Here's the troop.

Aggron @ Leftovers
Ability: Sturdy
EVs: 248 HP / 8 ATK / 252 SpD
Careful Nature
-Heavy Slam
-Rock Slide
-Avalanche
-Stealth Rock
I usually lead with this guy. His EV investment takes advantage of his natural defensive bulk and above average Attack stat. This guarantees Aggron a stealth Rock setup. Heavy Slam is a great move in my opinion with Aggron being as heavy as he is, it always does massive damage especially to the fairies. Avalanche handles Landorus and common dragons and grass types.

Venusaur @ Big Root
Ability: Overgrow
EVs: 252 HP / 4 SpA / 252 SpD
Calm Nature
-Leech Seed
-Toxic
-Giga Drain
-Synthesis
Kind of a typical Venusaur set here. EV investment makes him a great sponge for special attacks. Big Root gives advantage to Leech Seed and Giga Drain allowing maximum HP recovery. Toxic to wear down the opponent and Synthesis for reliable recovery.

Tyranitar @ Leftovers
Ability: Sand Stream
EVs: 192 HP / 64 Att / 252 Spe
Jolly Nature
-Dragon Dance
-Earthquake
-Crunch
-Stone Edge
Tyranitar is cool. Thanks to his ability and EV investment, he's pretty much a wall all around. After one Dragon Dance he's able to pummel through outspeeding most of the unboosted meta game and it's pretty much a "gg" after two DD. Especially if he comes in late in the game for a late sweep. Standard attack set to take advantage of his great STAB and Earthquake because it's Earthquake.
Latias @ Life Orb
Ability: Levitate
EVs: 80 HP / 232 SpA / 100 SpD / 96
Timid Nature
-Defog
-Draco Meteor
-Psyshock
-Surf
EV investment allows her to be a great wall for special attackers while also allowing her to be a pretty reliable Defog user. Life Orb and Special Attack investment also allows her to pummel through a lot. Draco Meteor will OHKO or 2HKO anything that doesn't resist it. Psyshock for STAB and Chanseys and Blisseys and Surf for reliable coverage.

Medicham @ Choice Scarf
Ability: Huge Power
EVs: 4 HP / 252 Att / 252 Spe
Jolly Nature
-Ice Punch
-High Jump Kick
-Zen Headbutt
-Posion Jab
BEST. REVENGE. KILLER. EVER. Almost nothing comes back from a one on one with him. Ice Punch for dragons and grounds. High Jump Kick because duh. Zen Heabutt for flinch hax and STAB and Poison Jab for the fairies who think they can out best him.

Slowbro-Mega @ Slowbrownite
Ability: Shell Armor
EVs: 8 HP / 16 Def / 232 SpA / 232 SpD
Calm Nature
-Calm Mind
-Scald
-Psyshock
-Flamethrower
Who's the mega? He's the mega. Why? because thanks to fantastic natural bulk, great ability and proper EV investment, after a Calm Mind, you can neither dent him nor resist him. Scald for STAB and burns, Psyshock for STAB and those that think they can wall him, and Flamethrower because why in the world would you pass up on such a move for a water type?! Bulky water behemoth? Yes. Why, yes please.
So there it is. Mega team and all. Tell me what you think!
Now it could use a little help. If you notice any holes that maybe I missed then I would love to hear your input. Anyhow. Here's the troop.

Aggron @ Leftovers
Ability: Sturdy
EVs: 248 HP / 8 ATK / 252 SpD
Careful Nature
-Heavy Slam
-Rock Slide
-Avalanche
-Stealth Rock
I usually lead with this guy. His EV investment takes advantage of his natural defensive bulk and above average Attack stat. This guarantees Aggron a stealth Rock setup. Heavy Slam is a great move in my opinion with Aggron being as heavy as he is, it always does massive damage especially to the fairies. Avalanche handles Landorus and common dragons and grass types.

Venusaur @ Big Root
Ability: Overgrow
EVs: 252 HP / 4 SpA / 252 SpD
Calm Nature
-Leech Seed
-Toxic
-Giga Drain
-Synthesis
Kind of a typical Venusaur set here. EV investment makes him a great sponge for special attacks. Big Root gives advantage to Leech Seed and Giga Drain allowing maximum HP recovery. Toxic to wear down the opponent and Synthesis for reliable recovery.

Tyranitar @ Leftovers
Ability: Sand Stream
EVs: 192 HP / 64 Att / 252 Spe
Jolly Nature
-Dragon Dance
-Earthquake
-Crunch
-Stone Edge
Tyranitar is cool. Thanks to his ability and EV investment, he's pretty much a wall all around. After one Dragon Dance he's able to pummel through outspeeding most of the unboosted meta game and it's pretty much a "gg" after two DD. Especially if he comes in late in the game for a late sweep. Standard attack set to take advantage of his great STAB and Earthquake because it's Earthquake.
Latias @ Life Orb
Ability: Levitate
EVs: 80 HP / 232 SpA / 100 SpD / 96
Timid Nature
-Defog
-Draco Meteor
-Psyshock
-Surf
EV investment allows her to be a great wall for special attackers while also allowing her to be a pretty reliable Defog user. Life Orb and Special Attack investment also allows her to pummel through a lot. Draco Meteor will OHKO or 2HKO anything that doesn't resist it. Psyshock for STAB and Chanseys and Blisseys and Surf for reliable coverage.

Medicham @ Choice Scarf
Ability: Huge Power
EVs: 4 HP / 252 Att / 252 Spe
Jolly Nature
-Ice Punch
-High Jump Kick
-Zen Headbutt
-Posion Jab
BEST. REVENGE. KILLER. EVER. Almost nothing comes back from a one on one with him. Ice Punch for dragons and grounds. High Jump Kick because duh. Zen Heabutt for flinch hax and STAB and Poison Jab for the fairies who think they can out best him.

Slowbro-Mega @ Slowbrownite
Ability: Shell Armor
EVs: 8 HP / 16 Def / 232 SpA / 232 SpD
Calm Nature
-Calm Mind
-Scald
-Psyshock
-Flamethrower
Who's the mega? He's the mega. Why? because thanks to fantastic natural bulk, great ability and proper EV investment, after a Calm Mind, you can neither dent him nor resist him. Scald for STAB and burns, Psyshock for STAB and those that think they can wall him, and Flamethrower because why in the world would you pass up on such a move for a water type?! Bulky water behemoth? Yes. Why, yes please.
So there it is. Mega team and all. Tell me what you think!