
Heracross has a unique trait of being a Guts Pokemon that resists its own self inflicted Burn, only sharing with trait with Luxray and Lavitar (and Flareon with Toxic Orb). So basically the only real Guts user as all 3 of those Pokemon are trash. This resistance to its own burns means that Heracross only takes 1/32 damage each turn. This effectively gives Heracross a x4 resistant Life Orb but significantly stronger, with barely any more damage taken each turn, not having to worry about status, and can hit hard with Facade. In addition, Heracross has other unique traits as well.

Being a Bug type, it resists the extremely common Ground type Spikes set up by Gliscor. And unlike Flying types, Heracross will at least take neutral damage to Ice, Electric, and Rock type Stealth Rock that is paired often with Ground Spikes. You also completely resist most of Gliscor’s attacks too while dealing at least 50% with Facade.
252 Atk Guts Heracross Facade (140 BP) vs. 244 HP / 36 Def Gliscor: 178-210 (50.5 - 59.6%) -- 30.5% chance to 2HKO after Poison Heal

Your typing completely walls Rillabooms not using Acrobatics, resisting Woodhammer, Grassy Glide, Knock Off, U-turn, Low Kick, and High Horsepower. On top of this, Grassy Terrain outheals the burn damage you take, and Jolly often gets the jump on Adamant Rillabooms.

Being a Fighting type, you naturally resist Dark. But as a Bug/Fighting type, you also resist Fighting as well. Fairy has this trait inherently, but this does come at the cost of a Poison weakness. This is why Dark/Fighting/Poison is a pretty common for Dark types to have as coverage. Heracross is unique in that it can actually switch into Dark Pulse/Focus Blast and not be threatened by Sludge Bomb. This also applies to several other Dark offensive types.