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Neutral B: Flamethrower, I can't think of anything different for a neutral to be honest
Side B: Flame Wheel, it could work similarly to Jigglypuff's Rollout. It could also leave the target with a poison effect, since in the Pokemon games it could burn the target
Down B: I have 3 options for a down special: body slam (would work similarly to Yoshi's and Bowser's down specials), dig (similar to shadow sneak, except the player could control where Typhlosion would pop out) and stomping tantrum (pretty much Charizard's down smash)
Up B: Uses Double Edge and its direction can be controlled by the player
Final Smash: summons a volcano in the middle of the stage and Typhlosion uses Eruption
Even though I'd love to see Typhlosion in Smash, it would be way better if Gold/Kris or Ethan/Lyra appeared as a Johto version of Red and used Totodile, Bayleef and Typhlosion