Answer by
Scarecrow (108)
Red Gyarados is tough if you are under level 30. Paralyze, freeze, or put it to sleep to make it easier to catch and safer for your team. Avoid confusing, poisoning or sandstorming/hailing as they can defeat Gyarados inadvertently. When its HP is low use Heavy, Lure, or Great/Ultra Balls for the greatest chance of catching it.