EDIT: Threw in a few changes, fixed some typos, and added their nicknames because why not.
Basically focusing reliability and raw power, no gimmicks or core strategy, just a lot of type coverage.
Though this is my first real spin in competitive play, I have a lot of experience in breeding and playing over wi-fi, so feel free to tear me apart.
These pics are not mine. Found'em on google.
RickAstley(Charizard) @ Charizardite Y
Nature: Naive
EVs: 252 SpA/252 Speed/4 Hp
Ability: Blaze then Drought
-Heat Wave
-Solarbeam
-Air Slash
-Focus Blast
RickAstley. To roll their team. Eh? Eh? ...aww.
A basic, SpAtk sweep build. I don't feel like breeding Solar Power because it's useless due to the ability switch. The idea here is pretty simple, and I feel more partial towards Charizard Y than Charizard X simply due to the fact that earthquake sweepers can smack Charizard X around. I do understand that he has a 4x weakness to SR, but I'll probably always open with him in doubles, and maybe sub him out for a Technician Scizor in singles. Air Slash is in that maybe category because it's the only Special Flying move I could find, and one of those would be nice.
MFW (Aegislash) @ Leftovers
Nature: Adamant
EVs: 252 HP/252 SpDef/4 Atk
Ability: Stance Change
-Shadow Sneak
-Sacred Sword
-King's Shield
-Swords Dance
MFW...my face when they made a sword pokemon and gave it swords dance.
Swords Dance on the literal SWORD POKEMON! But no, this guy is, in my personal opinion, the best thing to happen to pokemon in the last few gens. I love the "fencing" playstyle, and I pretty much built him around that. I will mention that I purposefully gave him low Speed IV simply because moving second means taking the hit in Shield Forme before dealing damage as opposed to going first and possibly being OHKOed. Come out of King's Shield with Sacred Sword, then finish off with Shadow Sneak (for priority after hitting Blade Forme) will usually net me a KO or two if I play defensively enough, or I can hit Swords Dance since it doesn't break my Shield Forme and setup if no real threats are present.
RightRound (Starmie) @ Choice Specs
Nature: Timid
EVs: 252 SpAtk/ 252 Speed/4 SpDef
Ability: Natural Cure
-Hydro Pump
-Psyshock
-Rapid Spin
-Trick
LIKE A RECORD BABY
Classic OU Starmie, but with Natural Cure over Analytic. I like Analytic, I do, but Natural Cure has just seen me more use in my experience with Starmie. Again, I haven't officially competed, so feel free to tell me I'm wrong.
She's also here to make sure that my Charizard Y doesn't get REKT by SR.
As far as Psyshock or Psychic, I'm not aware of the current OU meta, so I don't which will be more useful, but I'm using Psyshock atm as it helps Starmie be a pseudo-mixed attacker.
Bill (Hydreigon) @ Life Orb
Nature: Mild
EVs: 252 SpAtk/ 252 Speed/4 Hp
Ability: Levitate
-Draco Meteor
-Fire Blast
-Superpower
-Earthquake
This is Bill.
Yeah. Didn't see that coming with Fairy type newly in the mix, didja? But honestly, I love Hydriegon's versatility as a Mixed Attacker w/ Life Orb. He barely has any counters other than the Fairy Type SpAtk sweepers, and while there are some of those to be afraid of, I can usually deal with them with others on my team. It was this guy or Tyrantrum, which, from what I can tell, seems to be countered more heavily.
I'm a little hung up on Dark Pulse or Earthquake. Usually, I would go with Earthquake, but I have a hefty Earthquaker on team already, as seen below.
SumoSlam (Mamoswine) @ Life Orb
Nature: Adamant
EVs: 252 Atk/252 Hp/4 SpDef
Ability: Thick Fat
-Earthquake
-Icicle Crash / Avalanche
-Ice Shard
-Stealth Rock
His name is Sumo Slam because when he sumo slams, icicles crash and earthquakes happen. Yes, I know...kill myself.
I usually lead with this guy because he's a tanky physical attacker (especially with Thick Fat helping against fire types) and he can drop my SR. Pretty versatile imho, and probably my favorite pokemon as far as usability. The Life Orb, I'm still iffy about. If you have a recommendation for a held item, please let me know. Maybe a focus sash to guarantee SR against technician bullet punch?
Sengetsu (Mawile) @ Mawilite
Nature: Adamant
EVs: 252 Atk/252 HP/4 SpDef
Ability: Intimidate then Huge Power
-Swords Dance
-Play Rough
-Sucker Punch
-Fire Fang/Iron Head
I think she's about as scary as Sengetsu. (High five if you got the reference)
You're probably thinking something along the lines of I'm stupid or I don't know I can only mega evolve one pokemon per fight, but hear me out. Charizard's SpAtk isn't exactly pitiful without the stone. The only downside is now I can't rely on Solarbeam, but whatever. Mawile also serves as an Intimidator if I can't use her Mega, though I would normally prefer to use the Mega here, as otherwise the moveset isn't very viable without a SD setup (which is why it's there of course, but I do like using at least 1 SD in mega form as well). It will almost always depend on what pokemon my opponent is using as to what mega form I'll use in any given fight.
That being said, being able to intimidate on the switch-in, then use SD while moving into Mega form let's me abuse the Steel/Fairy typing (minimal weaknesses) and the opponent's attack reduction to set up.
I'm a little lost as to what the 4th move should be. I have Iron Head there for the STAB right now, but I'd like some type coverage, I'm just not sure what the meta currently is, and thus can't make an educated statement as to what type to cover. Either way, SD and Huge Power make all of her moves hurt. A lot.
On another note, I'm going to post a poll for the following predicament I'm in:
I had Scizor on the team as a Technician with Bullet Punch, Bug Bite, Pursuit, and U-Turn. I took him off for Charizard Y because I was lacking SpAtkers on the team other than Starmie and Hydreigon (who is a Mixed Attacker at best).
My question is this: If I were to put Scizor back on the team, who would I replace? Obviously one of the Mega Evolvers, to eliminate the problem of having two on a team. But dropping Mawile means dropping my Steel/Fairy typing, both in resistance and coverage, and also a powerful physical attacker with intimidate. Dropping Charizard Y means I'm back to my low SpAtk coverage problem again, and I also don't have Heat Wave to deal with my opponent's Klefki and/or Mawile. Sure I have Earthquake in Mamoswine, but that's risky to switch in as steel types can hit him pretty hard.
On a final note, I thank anyone who does for taking time out of their lives to even read this, much less post a comment and help me out. I really appreciate any feedback and (somewhat unrelated) I'm willing to share friend codes for anyone building up their safari. Unfortunately, I don't actually know what's in my Friend Safari, so....SURPRISES!
Basically focusing reliability and raw power, no gimmicks or core strategy, just a lot of type coverage.
Though this is my first real spin in competitive play, I have a lot of experience in breeding and playing over wi-fi, so feel free to tear me apart.
These pics are not mine. Found'em on google.

RickAstley(Charizard) @ Charizardite Y
Nature: Naive
EVs: 252 SpA/252 Speed/4 Hp
Ability: Blaze then Drought
-Heat Wave
-Solarbeam
-Air Slash
-Focus Blast
RickAstley. To roll their team. Eh? Eh? ...aww.
A basic, SpAtk sweep build. I don't feel like breeding Solar Power because it's useless due to the ability switch. The idea here is pretty simple, and I feel more partial towards Charizard Y than Charizard X simply due to the fact that earthquake sweepers can smack Charizard X around. I do understand that he has a 4x weakness to SR, but I'll probably always open with him in doubles, and maybe sub him out for a Technician Scizor in singles. Air Slash is in that maybe category because it's the only Special Flying move I could find, and one of those would be nice.

MFW (Aegislash) @ Leftovers
Nature: Adamant
EVs: 252 HP/252 SpDef/4 Atk
Ability: Stance Change
-Shadow Sneak
-Sacred Sword
-King's Shield
-Swords Dance
MFW...my face when they made a sword pokemon and gave it swords dance.
Swords Dance on the literal SWORD POKEMON! But no, this guy is, in my personal opinion, the best thing to happen to pokemon in the last few gens. I love the "fencing" playstyle, and I pretty much built him around that. I will mention that I purposefully gave him low Speed IV simply because moving second means taking the hit in Shield Forme before dealing damage as opposed to going first and possibly being OHKOed. Come out of King's Shield with Sacred Sword, then finish off with Shadow Sneak (for priority after hitting Blade Forme) will usually net me a KO or two if I play defensively enough, or I can hit Swords Dance since it doesn't break my Shield Forme and setup if no real threats are present.

RightRound (Starmie) @ Choice Specs
Nature: Timid
EVs: 252 SpAtk/ 252 Speed/4 SpDef
Ability: Natural Cure
-Hydro Pump
-Psyshock
-Rapid Spin
-Trick
LIKE A RECORD BABY
Classic OU Starmie, but with Natural Cure over Analytic. I like Analytic, I do, but Natural Cure has just seen me more use in my experience with Starmie. Again, I haven't officially competed, so feel free to tell me I'm wrong.
She's also here to make sure that my Charizard Y doesn't get REKT by SR.
As far as Psyshock or Psychic, I'm not aware of the current OU meta, so I don't which will be more useful, but I'm using Psyshock atm as it helps Starmie be a pseudo-mixed attacker.

Bill (Hydreigon) @ Life Orb
Nature: Mild
EVs: 252 SpAtk/ 252 Speed/4 Hp
Ability: Levitate
-Draco Meteor
-Fire Blast
-Superpower
-Earthquake
This is Bill.
Yeah. Didn't see that coming with Fairy type newly in the mix, didja? But honestly, I love Hydriegon's versatility as a Mixed Attacker w/ Life Orb. He barely has any counters other than the Fairy Type SpAtk sweepers, and while there are some of those to be afraid of, I can usually deal with them with others on my team. It was this guy or Tyrantrum, which, from what I can tell, seems to be countered more heavily.
I'm a little hung up on Dark Pulse or Earthquake. Usually, I would go with Earthquake, but I have a hefty Earthquaker on team already, as seen below.

SumoSlam (Mamoswine) @ Life Orb
Nature: Adamant
EVs: 252 Atk/252 Hp/4 SpDef
Ability: Thick Fat
-Earthquake
-Icicle Crash / Avalanche
-Ice Shard
-Stealth Rock
His name is Sumo Slam because when he sumo slams, icicles crash and earthquakes happen. Yes, I know...kill myself.
I usually lead with this guy because he's a tanky physical attacker (especially with Thick Fat helping against fire types) and he can drop my SR. Pretty versatile imho, and probably my favorite pokemon as far as usability. The Life Orb, I'm still iffy about. If you have a recommendation for a held item, please let me know. Maybe a focus sash to guarantee SR against technician bullet punch?

Sengetsu (Mawile) @ Mawilite
Nature: Adamant
EVs: 252 Atk/252 HP/4 SpDef
Ability: Intimidate then Huge Power
-Swords Dance
-Play Rough
-Sucker Punch
-Fire Fang/Iron Head
I think she's about as scary as Sengetsu. (High five if you got the reference)
You're probably thinking something along the lines of I'm stupid or I don't know I can only mega evolve one pokemon per fight, but hear me out. Charizard's SpAtk isn't exactly pitiful without the stone. The only downside is now I can't rely on Solarbeam, but whatever. Mawile also serves as an Intimidator if I can't use her Mega, though I would normally prefer to use the Mega here, as otherwise the moveset isn't very viable without a SD setup (which is why it's there of course, but I do like using at least 1 SD in mega form as well). It will almost always depend on what pokemon my opponent is using as to what mega form I'll use in any given fight.
That being said, being able to intimidate on the switch-in, then use SD while moving into Mega form let's me abuse the Steel/Fairy typing (minimal weaknesses) and the opponent's attack reduction to set up.
I'm a little lost as to what the 4th move should be. I have Iron Head there for the STAB right now, but I'd like some type coverage, I'm just not sure what the meta currently is, and thus can't make an educated statement as to what type to cover. Either way, SD and Huge Power make all of her moves hurt. A lot.
On another note, I'm going to post a poll for the following predicament I'm in:
I had Scizor on the team as a Technician with Bullet Punch, Bug Bite, Pursuit, and U-Turn. I took him off for Charizard Y because I was lacking SpAtkers on the team other than Starmie and Hydreigon (who is a Mixed Attacker at best).
My question is this: If I were to put Scizor back on the team, who would I replace? Obviously one of the Mega Evolvers, to eliminate the problem of having two on a team. But dropping Mawile means dropping my Steel/Fairy typing, both in resistance and coverage, and also a powerful physical attacker with intimidate. Dropping Charizard Y means I'm back to my low SpAtk coverage problem again, and I also don't have Heat Wave to deal with my opponent's Klefki and/or Mawile. Sure I have Earthquake in Mamoswine, but that's risky to switch in as steel types can hit him pretty hard.
On a final note, I thank anyone who does for taking time out of their lives to even read this, much less post a comment and help me out. I really appreciate any feedback and (somewhat unrelated) I'm willing to share friend codes for anyone building up their safari. Unfortunately, I don't actually know what's in my Friend Safari, so....SURPRISES!
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