Heracross (F) @ Flame Orb
Ability: Guts
Tera Type:
Rock
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Trailblaze
- Rock Slide
- Megahorn
- Close Combat
Heracross is known for its powerful STAB moves, both of which are 120 BP, and its Guts ability to power them up even further. Being a bulky Flying type with Multiscale, Dragonite swaps into these moves quite easily. It would then proceed to do massive damage with Fire Punch and, if the burn hasn't killed Heracross by then, Extreme Speed can finish it off.
252+ Atk Dragonite Fire Punch vs. 0 HP / 0 Def Heracross: 234-276 (77.7 - 91.6%) -- guaranteed 2HKO after burn damage
252+ Atk Dragonite Extreme Speed vs. 0 HP / 0 Def Heracross: 124-147 (41.1 - 48.8%) -- 14.1% chance to 2HKO after burn damage
A rock move isn't particularly uncommon on Heracross but, thanks to Multiscale, Dragonite will always tank one hit and always KO in response. There is no incentive to Terastalise against Heracross, because that simply trades the
possible rock move weakness for the guaranteed CC weakness. Not worth it. If Dragonite swaps into Heracross as it uses Trailblaze, this only reaffirms the idea that this Heracross doesn't have a rock move (Because almost all Guts Heracross run Swords Dance). However, Tera Rock suddenly turns the fire weakness into a resistance, and after breaking Multiscale with Trailblaze, Heracross can KO with a Rock Slide.
252+ Atk Dragonite Fire Punch vs. 0 HP / 0 Def Tera Rock Heracross: 58-69 (19.2 - 22.9%) -- 85.8% chance to 4HKO after burn damage
252+ Atk Dragonite Extreme Speed vs. 0 HP / 0 Def Tera Rock Heracross: 62-73 (20.5 - 24.2%) -- guaranteed 4HKO after burn damage
252 Atk Guts Tera Rock Heracross Trailblaze vs. 0 HP / 4 Def Multiscale Dragonite: 10-12 (3 - 3.7%) -- possibly the worst move ever
252 Atk Guts Tera Rock Heracross Rock Slide vs. 0 HP / 4 Def Dragonite: 372-440 (115.1 - 136.2%) -- guaranteed OHKO
Trailblaze is an important move because, if Heracross were to simply attack twice with Rock Slide, it could lose if Dragonite chose to Dragon Dance on turn 1, setting it up to KO with Earthquake. Dragon Dance and Fire Punch are the only realistic moves that Dragonite can make.
1. If Dragonite uses Dragon Dance as Heracross Tera Rocks and uses Trailblaze, Heracross is able to match the speed boost Dragonite gains. It will then outspeed and KO. Dragonite will not bother trying to Tera Normal E-Speed, because it's now a resisted move. Therefore, Dragonite goes down.
2. If Dragonite uses Fire Punch as Heracross Tera Rocks and uses Trailblaze, Heracross barely takes any damage and it simply KOs turn 2, risk free.
Whilst it's true that this strategy assumes the Dragonite will not Terastalise, this is a very reasonable condition considering Heracross has a Close Combat that can OHKO Tera Normal Dragonite, even through Multiscale.
252 Atk Guts Heracross Close Combat vs. 0 HP / 4 Def Multiscale Tera Normal Dragonite: 297-351 (91.9 - 108.6%) -- 50% chance to OHKO
Furthermore, powering up your
normal type move against a Rock type is not a worthy move. Dragonite is very unlikely to defensively Tera into a normal type, especially when Heracross is yet to reveal the rock move.
TLDR: Heracross is able to match Dragonite's speed boost as it breaks Multiscale, setting it up for an OHKO on turn 2. Tera Rock also turns Heracross' fire and flying weaknesses into resistances, and most rock resistances get smacked by CC