Things You'll Need
Instructions
Visit the fishing areas surrounding the port town of Vermillion City. This area offers the highest chance of encountering Gyarados.
Fish with your Super Rod at any of the waterside regions of the town. Activating the item begins the fishing mini-game.
Press the "A" button when an exclamation mark appears over your Pokemon trainer's head; your trainer will enter into battle with a Pokemon.
Run from the battle if a Pokemon other than a Red Gyarados appears. A Red Gyarados only has a one in 8,192 chance of appearing. Running from other Pokemon will reduce the time it takes to find this rare version of Gyarados.
Attack Red Gyarados until its health enters the lower third of the HP bar. The bar will then turn red, indicating that the Pokemon cannot easily resist capture.
Throw Poke Balls to capture the Red Gyarados. Red Gyarados has a low catch rate, and you may need to make multiple attempts to capture it before it finally joins your team.