You get it after you beat the elite 4.
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Using the Old Rod in Pokemon Ruby (or any Pokemon game for that matter) will get you a Magikarp as that is the only Pokemon an Old Rod can catch.
there is a firestone in fiery pass
magikarp.....
do u mean rainbow ticket? Cuz there is no rainbow pass in pkm ruby rainbow ticket can only get by nintendo event
If you have a game shark for your system check the cheats.