Mega Heracross Research (Gen 8 Info)
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Stats: 17+ HP, 13+ Attack, 17+ Defense, 19+ Special Defense, 25+ Speed.
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Mint: Adamant (for Attack) or Jolly (for Speed)
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Mega Heracross is beefy and strong, which tanks many things, those of which it needs to will be slanted.
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Mega Gyarados (Jolly), Mega Gyarados (Adamant), Mega Gallade (<26 Def, <29 HP), Skuntank, Gardevoir (If Outspeed), Grimmsnarl: Wins via OHKO Megahorn
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Dialga, Regigigas, Arceus, Slaking, Mega Gyarados (Jolly), Mega Gyarados (Adamant), Mega Lucario, Skuntank, Tyrantrum, Grimmsnarl: Wins via OHKO Close Combat
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Mega Gengar (If Sp.Atk. <23), Dragapult (Adamant, 31 Atk.): Wins Via OHKO Throat Chop
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(To be re-researched): Wins Via OHKO Thrash
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Golisopod, Mega Swampert, Garchomp, Feraligatr: Wins via 2HKO Megahorn
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Mega Scizor, Gyarados, Mega Swampert, Garchomp, Feraligatr: Wins via 2HKO Close Combat
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Zekrom, Zygarde: Wins Via 2HKO Close Combat/Megahorn if outspeed
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Dragapult: Wins via 2HKO Throat Chop (or Megahorn if Adamant, or Jolly with 24+ Atk.)
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Toxapex: With Venom Drench, loses via Venom Drench+Recover+Attack spam. Without Venom Drench, Wins via 3HKO anything (Adamant, -Throat Chop for Jolly)
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Check the heracross-mega-weak tag for what kills it.
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Mega Heracross: Adamant Mint OR 21+ Attack (for lowest reccomended defense. If opponent defense >25, do NOT use Jolly) Jolly. Whoever is faster (or has send if tie) gets 2HKO Close Combat.