I am playing Leaf green again, and I watched in anime that there is a red Gyarados which is said to be a shiny one. So I want to know is it available in Leaf-Green and how to catch it? I have encountered shiny Pokemon before but not once with Gyarados.
The famous Red Gyardos is not specifically found in LeafGreen
In Pokémon Gold, Silver, Crystal, HeartGold and SoulSilver, the red Gyarados is found in the Lake of Rage. The player has one chance to catch it and the incident triggers the battle against Team Rocket in the Team Rocket HQ in Mahogany Town. When captured or defeated, the red Gyarados drops a Red Scale. While this is the only chance to catch the Red Gyarados in the original games, it will respawn in the remakes after the player defeats Lance and the Elite Four, should the player fail to capture it.
In Pokémon FireRed and LeafGreen, in the Rocket Warehouse located on Five Island, one of the computers displays information about induced evolution using electromagnetic waves, hinting at what occurs to other Gyarados in Generation II's Lake of Rage.