Core Breakdown: OU [Mega Charizard Y | Tyranitar]

Introduction​

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Offense is, in my opinion, the best playstyle in ORAS OU. Stall is often an issue for offense to deal with; however, that isn't the case with this core. Mega Charizard Y is an amazing wallbreaker, being able to deal massive damage to anything that isn't extremely specially bulky or resistant to its moves. This is where Choice Band Tyranitar comes in; it traps anything that wants to switch in to Mega Charizard Y, such as Latios, Latias, and Chansey. It then threatens them by trapping them with Pursuit. This core easily applies a lot of offensive pressure on foes, which is very important for offense. Of course, you can't just throw any four Pokémon around this core and expect it to work to its full potential.
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Sets​

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Charizard (M) @ Charizardite Y
Trait: Blaze
EVs: 252 SAtk / 4 SDef / 252 Spd
IVs: 0 Atk
Timid Nature (+Spd, -Atk)
- Fire Blast
- Focus Blast
- Solar Beam
- Roost​

This is the standard wallbreaker set for Charizard. Thanks to gaining Drought when it Mega Evolves, a sun-boosted Fire Blast nearly knocks out most Pokémon in the metagame with one or two hits, excluding Pokémon that resist and specially bulky Pokémon. Fire Blast still puts heavy dents in the Pokémon that resist it, though. It takes out Pokémon such as standard Mega Sableye and Clefable with two hits and is a 3HKO on most common Latios switch-ins. Focus Blast covers Pokémon like Heatran and Tyranitar, which would otherwise be a lot more threatening. Solar Beam is coverage for Water-type Pokémon such as Keldeo and Suicune. Roost is there as recovery that can be used against Pokémon that can't take Mega Charizard Y out. Charizard can safely use the move on Pokémon forced out to keep its HP high so that it is able to switch in more and not lose to priority moves.

EVs: This set isn't about taking hits. The EVs for Mega Charizard Y's Speed should be maxed out so it can outspeed the Pokémon it needs to and tie with Pokémon with the same base Speed. Maxing out its Special Attack is necessary for dealing the most possible damage.


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Tyranitar (M) @ Choice Band
Trait: Sand Stream
EVs: 100 HP / 252 Atk / 156 Spd
Adamant Nature (+Atk, -SAtk)
- Stone Edge
- Crunch
- Pursuit
- Superpower​

Stone Edge is Tyranitar's main STAB move. It's going to hit almost everything really hard. Rock-resistant Pokémon and physical walls are mostly covered by Mega Charizard Y, which is another reason this core is so great. Crunch is a stronger Dark-type STAB move meant to hit hard. It can be used over Pursuit if you feel like the opponent is keeping their Pokémon in. Choice Band Tyranitar pairs nicely with Mega Charizard Y for a simple reason: it Pursuit traps Pokémon that resist or tank Mega Charizard Y's attacks, such as Chansey, Latias, and Latios, the former taking massive damage and the last two getting OHKOed. Superpower hits Pokémon like Chansey that sometimes stay in on the Pursuit to heal up. It also hits other Pokémon such as opposing Tyranitar and Reflect Type Latias.

EVs: Attack should always be maxed out to deal the most possible damage. Speed, however, may vary depending on what specific Pokémon should be outsped. 156 Speed EVs is enough to outspeed Mandibuzz with no Speed investment so they don't spam Roost and completely wall Tyranitar. Running 176 Speed EVs allows it to outspeed Adamant Azumarill. Maximum Speed can be run to outspeed Pokémon such as Mega Venusaur, Rotom-W, and defensive Landorus-T. Any remaining EVs go into HP to give Tyranitar some bulk.
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Team Options​

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As stated earlier, you can't just throw this core with any four Pokémon and expect it to work. This core is meant for offensive teams. A Water-resistant Pokémon is needed, as the core itself is weak to the type. Latios is a potential partner, as it's fast and can take away entry hazards, which the core is weak to. Latios is also good because it outspeeds Keldeo, which can be a threat to this core. Ferrothorn can take Water- and Electric-type attacks that also threaten the core. Hazard support is crucial for this core, so make sure you keep that in mind. Zapdos and Latias are also optional Defoggers. Starmie can be used to Rapid Spin away entry hazards while also providing a Water- and Fighting-resistant Pokémon. Garchomp and offensive Landorus-T are good Pokémon to get up your own hazards, which can help with pressuring the opponent. Other Pokémon that apply pressure on the opponent are nice to have too. Keldeo works well, as it resists Water and hits really hard. The core can be paired with VoltTurn support so that Tyranitar or Mega Charizard Y can be brought in safely.
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Conclusion​

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This is an amazing offensive core to use in OU. It can work well versus any playstyle, including stall and hyper offense. You're going to have to play aggressively sometimes, which means making predictions. For example, if the opponent has a Chansey or Latios, they will likely switch it into your Charizard. Knowing this, you can switch in your Tyranitar on your opponent's switch; it can then trap the opponent's Pokémon for a possible KO. It is important to control entry hazards well and keep up the pressure on the opponent as well. Finally, make sure to build around this core carefully because teammates are crucial for it to work.

Spoiler: Special Thanks

Annoying Orange - Writer, Artist
E.T. - QC, Grammar
Sobi - Grammar
Joyverse - QC
Redjoker25 - Grammar

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