Hi guys! I'm back to finish this, and the A+ bracket is ready to be posted. Going to be starting this one off with a mon that has endured since the inception of the meta:
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Pesky Dragons and Fairies ruining your good times? Flying-type Heatran offers a new Ground immunity and neutrality to Fighting in exchange for a weakness to the less common Rock and Electric. Being able to check threats like Steel-type Dragonite based on coverage and counter Mega Altaria, Flying-type Heatran has found a place in the meta as a blanket check to anything that isn't running Water, Electric, or Rock coverage. Even if those types are troubling you, Grass-type Heatran is capable of answering the things its Flying-type variant struggles with. Walling different threats based on its third type has allowed Heatran to become a thorn in any offense team's side and secure a spot in A+.
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Water-type Hippowdon is the more stall-friendly version of Water-type Gliscor, boasting better bulk, less exploitable typing, and access to phasing moves. While it doesn't have the utility of Gliscor, Water-type Hippowdon is great at taking hits(it is only weak to Grass) and Roar'ing out threats to stall teams like Dragonite and Altaria. Being one of the few reliable checks to some of the more powerful setup sweepers in the meta, Hippowdon is a valuable asset to any stall team.
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Fire-type Mega Altaria doesn't gain very much defensively outside of a Steel and Ice neutrality, but offensively a Fire Typing makes it immune to the burns and able to muscle past Steel types like Water or Dragon-type Skarmory with a STAB Fire Blast. With Cotton Guard, you become capable of setting up on things like Dragonite and Gliscor, and a little HP investment means you can set up on a +3 Manaphy as well. Bulky offense and Dark spam teams are absolutely crushed by Altaria, making it a very potent threat in the metagame.
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Ground-type Mega Slowbro follows the same idea as other Water/Grounds in the meta: use fantastic typing and recovery moves to become unkillable. The thing that makes Mega Slowbro stand out is its ability to win games on its own with a double dance set. It can set up on Dragonite, Altaria, and generally anything that isn't Grass or capable of nuking on the special side. Unprepared teams will have a lot of trouble if it manages to get 1 free turn to boost.
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Mega Lopunny's Normal/Fighting coverage is no longer unresisted in Hidden Type, but adding a Fire typing can help get around the new walls built to stop it. Being one of the fastest Pokemon in the meta, Lopunny makes for a great revenge killer that now can't be burned and is no longer weak to Fairy. Fire-type Lopunny excels at cleaning up offensive teams, landing it a spot in A+.
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Charizard-Y is a fierce wallbreaker that thrives in a meta of Steel-types and Water/Grounds. STAB on Solarbeam makes it incredibly difficult to switch into, and the additional Grass typing gives it more longevity by removing the Electric weakness and basically resisting Water under the Sun. Only a handful of Pokemon like Chansey and Heatran give Charizard-Y trouble, who otherwise terrorizes balance and stall. With its incredible firepower, fantastic offensive typing, and speed it's no wonder why it's ranked so highly.