In Sootopolis city use go by the Gym and go South until you are by the water then use super rod and you should see Gyarados if you dont keep trying. This method is easier than making Magikarp evolve XD
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sinnoh Pokemon won't appear in Sapphire version!
It is not possible to get the Red Gyarados in Pokémon Yellow version. You can only get it in Gold, Silver and Crystal version.
Best non-legendary water pokemon would be Gyarados. Best legendary water pokemon is Kyogre.
Quick balls don't exist in sapphire.
HM06 Rock Smash