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.
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Heracross is found in pattern bush on six island.
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.
Spinarak, heracross, weedle, caterpie.
To get Pokemon firered on PC download a vba and Pokemon firered ROM