How do you beat the cinnabar island gym in Pokemon Yellow? - Answers

Blaine, the Cinnabar Island's Gym Leader, has Ninetales, Rapidash, and Arcanine, which are all weak against Water, Ground, and Rock-types. I'd recommend using Water and/or Rock types with a great moveset with the same types, because Water and Rock are not weak against Fire types; halving the damage taken. You'd might want to bring a Pokemon like Tentacruel, Graveler, Poliwhirl (or Poliwrath if you can), Rhydon, Blastoise, Omastar, or Kabutops. Train them till they are about level 49-50 at least just in case. For Omastar and Kabutops, the Rock/Water type knocks down 1/4 of the Fire-type's move, so they are great for defending themselves; just ensure you have a good Rock type or Water type move to along with them and give it a try when you feel confident with your team.