>>44100612>Typhlosion - Fire/RockAs much as I love Typhlosion, the Gen 2 starters were meant to be pure type since the theme of Gen 2 is Tradition. If you absolutely had to give him second type it would make sense to be ground since it goes with the volcano theme
Best way to fix Typh in my opinion is to give him ground moves like earth power and earthquake as well as an electric move or 2 like thunderbolt or thuder punch