Typhlosion: Good choice. Great choice. The best choice. Here is what I would do + some other options:
Flamethrower: Ultimate Fire power, especially with Suuny Day.
Sunny Day: While Typhlosion can't learn Solarbeam, Sunny Day still hs two benefits, it weakens the power of Water and increaases the power of Fire.
Earthquake: Powerful to saythe least.
Toxic: Inflicts bad poison, which is always great.
Other options: Smokescreen, Swift, Dig, Fire Blast.