Set Description
This set mostly acts as an early- and mid-game wallbreaker, capitalizing on bulky Psychic-, Normal-, and Water-types. Megahorn OHKOes Celebi and Claydol, has a chance to 3HKO defensive Suicune and Swampert, and 2HKOes Blissey and Snorlax. Furthermore, it can also allow Heracross to hold its ground against more offensive non-hovering special threats by threatening to 2HKO offensive Suicune and OHKO Jolteon. Rock Slide punishes switch-ins such as Salamence, Gyarados, Zapdos, and Moltres. Focus Punch is for a predicted switch to Skarmory, thus being mostly used when Magneton is absent on the team. In addition, it exploits Rest Pokemon such as Snorlax and Hariyama. Otherwise, Brick Break 2HKOes Snorlax and Blissey without the inaccuracy of Megahorn and OHKOes Magneton.
When it comes to the last slot, Swords Dance gives Heracross the ability to sweep bulkier teams and can be used to set up on a predicted switch or a Choice-locked Earthquake. After a Swords Dance, Rock Slide OHKOes Zapdos and offensive Gengar and has a chance to OHKO Adamant Gyarados and slower variants of Salamence. Substitute pairs well with Focus Punch, allowing Heracross to scout for Drill Peck on Skarmory and potentially play mind games with it. Substitute can also catch an attempted sacrifice into a Dugtrio trap, protect Heracross from Forretress, bring Heracross into Swarm range, and exploit the miss rate of Swampert's Hydro Pump. Adamant Hidden Power Ghost comfortably KOes Gengar in sand after Megahorn, making Heracross a Gengar lure.
Guts is generally the preferred ability on this set to allow Heracross to face Gengar and Zapdos without fear, but Swarm is appropriate when the team has additional Gengar pivots like Starmie and when Heracross's HP can be controlled with Substitute. An Adamant nature increases the odds that Suicune, Swampert, Snorlax, Metagross, Gengar, and Gyarados are taken out with one less hit, but Jolly allows Heracross to outspeed slower variants of Salamence, Modest Zapdos, and Modest Moltres. Jolly Heracross only needs 216 Speed EVs to outspeeds Modest Moltres and Timid Venusaur, so the rest can be allocated to bulk.
Heracross can also be given varying amounts of bulk. Bulk EVs are useful on the Leftovers set, as this Heracross doesn't get chipped into KO range by sand. Although maximum Speed is straightforward, a little bulk can go a long way; lowering the Speed to 250 and putting the remaining EVs in HP lets Heracross outspeed Adamant Claydol while increasing the odds of surviving Jirachi's and Celebi's Psychic, fast variants of which offensive teams frequently use to check Heracross. Swarm might be preferred here, as Heracross gets a 50% chance to OHKO bulkless Jirachi after taking Psychic. An alternative way to EV Heracross is to make it bulky with 144 HP / 184 SpD, which allows Heracross to survive Timid Zapdos's Thunderbolt twice, Timid Moltres's Flamethrower in sand, and +1 Adamant Dragon Dance Tyranitar's Rock Slide in sand. The rest of the EVs are split between Attack and Speed; Heracross should achieve at least 244 Speed to outrun Jolly Tyranitar, but it is recommended to add more Speed EVs to creep Celebi, Jirachi, and Zapdos that also try to achieve the same benchmark.
Team Options
Dugtrio easily traps Heracross without Substitute or Salac Berry, so having one's own Dugtrio or Porygon2 as a partner can be helpful either to trap Dugtrio beforehand or to revenge kill it. By using Heracross as bait, this core also paves the way for other Dugtrio-weak teammates like Tyranitar, Celebi, Jirachi, and Raikou to shine. Porygon2 also defensively synergizes with Heracross; of all Dugtrio-immune threats, Salamence is the one that Heracross finds the hardest time breaking through, but apart from Choice Band-boosted Brick Break, Porygon2 nullifies whatever Salamence throws at it. In addition to the Dugtrio revenge kill tactic, offensive Celebi and Jirachi also appreciate the chip damage that Heracross induces on Salamence and Zapdos, bringing them into KO range of boosted Psychic. Defensively, with Dugtrio, Jirachi suffices as a Rock-resistant Pokemon that only needs to halt Aerodactyl, because Heracross exerts massive offensive pressure on Tyranitar, and Dugtrio can revenge kill Tyranitar should something go wrong. Celebi and Jirachi also appreciate Heracross's ability to pivot into Hidden Power Bug or Earthquake from Tyranitar, and Heracross gets to come in for free after Dugtrio takes the grounded Psychic-types out.
Paralysis support such as Thunder Wave from Zapdos onto opposing Zapdos or Jolteon or Thunder Wave from Gyarados onto the opponent's whole slew of fast threats allows Heracross to fully exploit its high Attack without being forced out. Substitute Heracross can also exploit opportunities generated by full paralysis. Through Baton Pass or double switching, Zapdos provides entry points for Heracross by luring Blissey, Celebi, Snorlax, Claydol, and Tyranitar. Furthermore, Zapdos provides coverage against Dugtrio-immune threats like Gyarados, Skarmory, Gengar, Moltres and Charizard, which all annoy Heracross. Water-types such as Suicune and Swampert check Salamence, which comes in rather freely on Heracross. Suicune can pivot into Moltres and Charizard, while Swampert can also pivot into and play mind games with Zapdos. In addition, they can lure and weaken Zapdos.
Other physical threats can also complement Heracross. Choice Band or mixed Metagross can lure Skarmory and Zapdos in and either wear them down or take them out with Explosion and Thunder Punch or Rock Slide. Occasionally, Heracross's Ground resistance allows it to be a pivot into Claydol's Earthquake for Metagross. As a Water-type pivot, Heracross can bear the brunt of the opponent's bulky Water-types, softening the opponent's team before Tyranitar presents itself. Chipping Metagross, Gengar, and Zapdos with Heracross is going to be immensely useful in preparing for a sweep by Dragon Dance Tyranitar, Dragon Dance Salamence, or mixed Salamence. To obtain these setup opportunities, Dragon Dance sweepers can capitalize on Choice-locked Aerial Ace from Dugtrio, and conversely, Heracross can exploit Dugtrio revenge killing Tyranitar or Metagross in the same vein as Jirachi to chip its checks.
Finally, Magneton can be used with Heracross to remove Skarmory, but this is perhaps the set that least requires Magneton support due to Focus Punch. Still, removing Drill Peck Skarmory in particular eliminates the need for making predictions with Focus Punch.