First, you must have to be strong enough to beat and catch it(and you must have the pokedex). Next, go to Pallet Town and talk to your mum. Then, talk to Gary's sister Daisy(i dunno her name was right or not). After that, talk to prof.oak. Finnaly, go to the last Pokemon of prof.oak and press A Button and Latias will appear!(sometimes it works and sometimes not)
Latias isn't wild in firered (latias is a HOENN Pokemon). You have to trade it from emerald or sapphire once you complete the tasks for CELIO at Seven Island.
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You cnnot catch it in Pokemon fire red ,but you can catch it in Pokemon Diamond and Pearl.If you want it to be in your fire red,you will have to migrate it from your Diamond/pearl to your fire red.
You can only catch them in Pokemon fire red.
You can't catch it on Pokemon Fire Red. You have to trade it from Leaf Green.
You catch Magikarp on route 12.
Trade It From Pokemon Fire Red Or Leaf Green