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Heracross is found in pattern bush on six island.
The Pattern Bush only has one secret that isn't really related to the actually game in any way. If you opened up a fire red or leaf green cartridge. you would see the missing grass makes an almost perfect reapplication.On six island in the north.
Get the TM secret power teach it to a Pokemon then find either a tree with vines, an indent in the wall or a big bush use secret power on these to create your own secret base.
Spinarak, heracross, weedle, caterpie.
you get it in the pattern bush, and that's in six island