Ride bike over water
Ride bike over water with this code.
0000295F000A
101DC9D40007
830050000000
830050020000
72036E3C0100
32036E430000
or you could try this:
3886329423BF
4772D3BB4241
And if you need a bike, then check out this page: https://www.supercheats.com/gameboyadvance/pokemon-firered/10049/get-a-bike/
If you need more help, we've got more Pokemon FireRed cheats and also check out all of the answers for this game
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