It is not known to evolve into or from any other Pokémon.
Heracross are large beetle-like Pokémon covered in a blue exoskeleton. The most notable feature is the large, pronged horn protruding out of its forehead. Heracross has two antennae with spherical tips to the sides of the horn, and elliptical eyes with yellow scleras. Heracross has small spiky extensions on the forearm segments of its exoskeleton, and two claws on its hands. Heracross has a single spiky extension on each thigh, and one pointed toe on its feet. The lines on its exoskeleton make it look like it is smiling.
A female Heracross's horn has a heart-like shape at the end, whereas the male's end in an 'X' shape.
Heracross is surprisingly strong for its size, and is able to knock down massive trees with its mighty horn. Heracross can use said horn to lift other Pokémon, and its shell is said to be as tough as steel. Heracross is also able to fly, and is even depicted in the anime to be strong enough in its flying to transport its Trainer over limited distances.
Heracross live in groups in deep forests. They bite through the bark of trees with their strong jaws to get to the sweet sap inside. This suggests a relation to fellow Bug-typePinsir, who share many of the same habits. Heracross's eating habits unwittingly enter them into a symbiotic relationship with Butterfree, who also love tree sap, but lack the strength to get to it. Despite their size, great strength, and powerful horns, Heracross are really docile creatures who prefer peace over resorting to violence.
Heracross prefer to live in deep forests, such as those in Johto, where there are many trees for them to suck sap from.
Heracross's preferred diet is mainly made up of sap and other plant juices. This makes them unpopular among Grass-type Pokémon like Bulbasaur, as Heracross often try to suck nourishment from them. This also makes them easy to attract with honey.
This Pokémon was unavailable prior to Generation I.