Heracross is the Bug horned Pokemon. It can only be found in honey trees but still they are very rare.
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to get heracross you have to use a honey on a honey tree. then you wait awhile and go back to the honey tree you put the honey on and if the honey tree is shaking click a on it and a Pokemon will show up. but there is a low possibility that the Pokemon you find in the tree is heracross.
on a island
In Pokemon Crystal Version, a Heracross will occasionally appear when you use headbutt on trees.
on route 6665
in diamond, pearl and platinum it is heracross