Overview
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Mega Heracross (there's a bit of leeway with when exactly to add the Mega prefix, but generally you should add it if something only applies to the Mega forme, which obviously is the case here) boasts an incredible base Attack stat of 185, making it one of the most powerful pokemon there is. Paired with the its ability Skill Link (RC) and access to mulitple 5 hit several multi-hit (they're not five-hit moves in and of themselves, and 'multiple multi-hit' sounds awkward obv) moves, this makes make its damage output very impressive; (SC) but however, (stronger break is appropriate here) it is walled by the two best pivots in the meta, Aegislash and Landorus-T. Fair bulk at 80 / 115 / 105, (add spaces around slashes) coupled with resistances to Ground-, Dark- and Fighting-types make makes it able to take some punishment; (SC) however, it's its resistances aren't the best, (AC) and it suffers a nasty 4x weakness to Flying-type moves, and most things threats are able to hit it for neutral damage. Mega Heracross competes with and is quite outclassed by Mega Kangaskhan for a Mega physical attacker; (SC) but it's its appeal consists of its huge base Attack and complimentary complementary ability is the appeal Heracross has. Overall, (AC) your Mega slot is best used on something else.
Mega Bulky Attacker
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name: Mega Bulky Attacker
move 1: Close Combat
move 2: Pin Missile
move 3: Rock Blast
move 4: Protect
ability: Guts
item: Heracronite
evs: 164 HP / 252 Atk / 92 Spe
nature: Adamant
Moves
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Close Combat is Heracross' Heracross's best Fighting-type STAB attack, able to OHKO standard Ferrothorn and Mega Kangaskhan, as well as hitting any non resist anything that doesn't resist it incredibly hard. Pin Missile hits like a truck too. (any notable targets?) Rock Blast is coverage for Flying- and Ghost-types. (such as?) Protect keeps Mega Heracross safe while a threat is removed by a partner or Tailwind is set back up, but use it sparingly, (AC) as it will also stall out your own speed control turns.
Set Details
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252 Attack EVs with an Adamant nature allows for maximum attack maximize Mega Heracross's attacking power. 92 Speed EVs allow allows Mega Heracross to out speed 0 Speed Rotom formes outspeed uninvested Rotom-A without Tailwind, and beats things as well as threats like Skymin Shaymin-S and Mega Manectric with Tailwind up. The remaining EVs are put into HP to aid overall bulk. Alternative spreads can be either include 28 HP / 252 Atk / 228 Spe with an Adamant nature, which allows Heracross to outspeed maximum Speed base 70s before and on the mega evolving turn Mega Evolving (the ME turn being included is pretty much implied) and neutral-natured (add hyphen) base 70s after Mega Evolution, or 40 HP / 252 Atk / 216 Spe with a Jolly nature, which beats maximum Speed base 70s even after Mega Evolution.
Usage Tips
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Using Guts a as base ability lets Heracross stay in its base form forme and take the burn if it is unavoidable. If both are hit for neutral damage, Pin Missile should be used over Close Combat to avoid racking up defence defense drops. Heracross' Mega Heracross's great bulk make it very hard to OHKO with a non-super (add hyphen) effective or un-boosted unboosted hit. Multi-hit (add hyphen) moves like such as Pin Missile and Rock Blast will activate Sitrus Berries in between hits, and which can mean things their targets will survive, so use Close Combat on common Sitrus Berry users if possible to avoid that. Mega Heracross is only effective with speed control in place, so try to make sure you already have it in place before you bring Heracross it in, or get it up up on the turn you mega evolve it Mega Evolves. Mega Heracross can take hits well, (AC) so don't be afraid to take some damage while dishing some out.
Team Options
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Tailwind is practically essential for this set, so setters are its main partners. Zapdos can beat Flying-types that threaten Heracross while setting up Tailwind for it, Togekiss can provide Follow Me support and aid Heracross with Serene Grace Air Slashes to buy some free attacking turns, (AC) and Suicune can threaten Fire-types and provide Snarl support; (SC) however, (AC) Zapdos and Togekiss leave you Mega Heracross vulnerable to Mega Diancie. Pokemon that can beat Fire- and Fairy-types (add hyphens) are good teammates; (remove space, SC) Heatran is an especially great partner, (AC) as it resists Fairy-, Flying-, (AC, add hyphens) and Psychic-type (add hyphen) moves, while being and is immune to Fire, all of hera's Heracross's weaknesses. Landorus-T can provide Intimidate support to further boost Heracross' Heracross's large defences defenses. (murican spellings) Icy Wind is also an option for speed control; (SC) Cresselia does this well. Thunder Wave is another option for speed control; (SC) Thundurus-I Thundurus can do this while being able to Taunt and prevent status with Taunt, but this will again leave you Mega Heracross open to Mega Diancie. Quick Guard is great to block Prankster status and Brave Birds that Heracross hates. Terrakion can threaten Flying-types with STAB Rock Slide and use Quick Guard. Tyranitar beats a lot (space) of things foes that threaten Heracross too. Rotom-W can use Will-O-Wisp to support Heracross with burns, while also beating Flying- and Fire-types. Aegislash and Hitmontop can provide Wide Guard to block Heat Waves and Pixilate Hyper Voices; (SC) the former beats Fairy-Types too, but it opens a weakness to Mega Charizard Y.
Choice Scarf
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name: Choice Scarf
move 1: Close Combat
move 2: Megahorn
move 3: Knock Off
move 4: Rock Slide
ability: Guts
item: Choice Scarf
evs: 4 HP / 252 Atk / 252 Spe
nature: Adamant
Moves
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Close Combat is used for Fighting STAB (RC) and is able to OHKO threats such as Mega Kangaskhan and Ferrothorn. Megahorn is equally powerful (RC) and doesn't drop defensive stats, so it should be used over Close Combat where possible; (SC) however, (AC) 85% accuracy is the price of preserving the defences defenses. Knock Off is coverage allowing that allows Heracross to hit Ghost-types (RC) and for punishing punish Landorus-T and Aegislash switch-ins. Rock Slide is also coverage and should only be used on things it hits super effectively; (AC) but does come with the it also comes with a flinch chance of Rock Slide.
Set Details
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252 Speed EVs, paired with a Choice Scarf, (AC) allows allow Heracross to outspeed Timid Skymin Shaymin-S (RC) and everything below. 252 Attack EVs with an Adamant nature ensures ensure maximum damage output from its powerful STABs. Guts lets Heracross ignore burns and the Attack drops drop that comes with them, boosting its Attack to impressive levels.
Usage Tips
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Guts allows Heracross to stay in on common burn users and do some damage. (space) This set misses out on a lot (space) of OHKOes OHKOs, (AC) so beware. The coverage moves on this set allows Heracross to hit every relevant pokemon in the tier for at least neutral damage; (SC) however, (AC) it can't freely switch moves due to the Choice Scarf, (comma) Using a Choice Scarf which means that Heracross will be forced out after almost every kill KO due to fear of hitting a switch-in for very low damage and killing momentum.
Team Options
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Mega Diancie makes a good partner, (AC) as it can eliminate Flying- and Fire-types, while Heracross can take out Steel-types with powerful Close Combats. Rotom-W can handle Fire-types very well, as well as while also being able to use Will-O-Wisp on Heracross to activate Guts and give it an Attack boost. Heatran can wall most Fire-, Flying- and Fairy-types (RC) and is able to safely switch in on all of Heracross' Heracross's (different conventions for this sort of thing, and we follow the one that also puts a possessive s after singulars ending in s) weaknesses. Redirection can be effective, (AC) as it takes some pressure off of being locked into a move. Jirachi is the closest fit, resisting 3 of its 4 three of Heracross's four (spell out numbers below ten please) weaknesses, including the 4x weakness to Flying-types moves. It is best used once Fire-types are gone, (AC) as they share that weakness.
Other Options
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Heracross's additional coverage options are is very limited, (AC) as it gets all the tools it needs to succeed in its main moveset, so these would be detrimental apart from extreme cases. Options on the Mega set include Knock Off, (AC) to hit ghosts Ghost-types, (AC) and Earthquake; (SC) however, (AC) Knock Off is only really for Aegislash (RC) and hits activates King's (apostrophe) Shield, and Earthquake is less than desirable. Arm Thrust can be used instead of Close Combat if you really dislike the defence defense drops from Close Combat. It also allows you Mega Heracross to damage SubTran Substitute Heatran; (SC) however, (AC) Ferrothorn becomes a big issue, as do random Rocky Helmet users and Sitrus Berry users. A Trick Room set is also viable, using 252 HP / 252 Attack with a Brave nature and 0 Speed IVs; (SC) however, (AC) Mega Abomasnow or and Mega Camerupt are a better fit for a Trick Room Mega Evolution. Moxie is an option both before Mega Evolution and on the Choice Scarf set, as it allows you to pick up a KO on a weakened Pokemon before Mega Evolving (RC) or keep offensive momentum up on the Choice Scarf set, respectively.
Checks & Counters (please capitalise every word in the section headers)
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**Offensive type advantage**: Talonflame absolutely destroys Heracross with Brave Bird (RC) and can OHKO with Flare Blitz if you try using Quick Guard. Standard attacking Heatran will OHKO with Heat Wave most heat wave 68.8% (be careful with percentages because they're really trite and off-putting and often unnecessary; it honestly doesn't matter if it's 55% or 69% or 75%, the only thing that's relevant is that Heracross usually won't survive it, and using the explicit percentage makes it come off as if that number has some special relevance, while it really doesn't) of the time. Mega Diancie and Mega Metagross are very big issues, as both can OHKO can can live Heracross and survive any of Hera's its moves. Skymin Shaymin-S and Latios can KO easily; (SC) however, (AC) Heracross can OHKO a lot (space) of these threats can be OHKO'd by Heracross while if Tailwind is up
**Defensive type advantage**: Aegislash is the only relevant Pokemon in the tier that Heracross can't hit for neutral damage with any of its standard moves. It is easily the biggest block to Heracross, (AC) as it resists 2 off Heracross' two of its moves, and is immune to the other, as well as being and is able to hit back hard. Landorus-T can intimidate lower Heracross's Attack with Intimidate and tank anything it has to offer, forcing it out.
**Redirection**: Redirection is an issue for Heracross because so many of the popular users resist a lot (space) of its moves: (colon) for instance, Amoonguss resists Fighting (RC) and Togekiss 4x resists Bug and Fighting. (period) and in general Additionally, if Heracross can't hit what its aiming for, its left open and will generally be taken down easily.
**Speed control**: Trick Room is a problem with this (which?) set, (AC) as it (Mega) (depending on which set you're referring to) Heracross is usually coupled with Tailwind support or some other form of speed control. While this set can OHKO the standard Trick Room Cresselia set with Pin Missile, it can be EV'd EVed to live this move, and other setters such as Aromatisse can survive an attack. Jellicent can easily set up Trick Room without being bothered by Heracross. Being paralysed paralyzed is also a problem, (AC) as it renders Tailwind useless and leaves Heracross open to attacks. Notably, Thundurus's Thundurus I can use ability Prankster to ensure a paralysis guarantees it can paralyze Heracross with Thunder Wave.
**Burns and Intimidate**: Once Heracross has Mega Evolved, being burnt burned (game's spelling for an effectively technical term) will be a massive detriment (Scarf set likes it). Sableye can use Prankster Will-O-Wisp to get a burn off even while Tailwind is up. Intimidate causes an problem, (AC) as Heracross needs to be at full power to be effective. Landorus-T and Gyarados can be a problem, as although they can't really outdamage Heracross and require a partner to beat it, they can swap in and out for Intimidate drops and really cripple Heracross.