Welcome to Serebii, Apollo. Glad to see another interested in using his favorites here.
As for legendaries, I use them if they're not more over-powered than any other Pokemon out there. It's how I roll.
For a Typhlosion, I've got a nice set, if you're willing to breed one. If you've got wifi, I've got a shiny Cyndaquil I can clone in my own game and give to you. (Don't worry, it's perfectly legit, and an exact copy as the original.) It's got its own bred-on moves, so it'll be a great addition to your collection.
Choice Scarf set:
Eruption
Focus Blast
Extrasensory
Hidden Power (the Cyndaquil I mentioned has Hidden Power Dragon 70, I think)/Fire Blast (to be used if you switch out, after your HP isn't full and Eruption gets weaker)
Another useful special set:
Fire Blast
Focus Blast
Extrasensory
Flame Charge (boosts speed so that it has the effect of a Choice Scarf. However, it doesn't hit very hard, so running Eruption as well isn't advised.
I hope these helped. If you ever want to get into battling, there are plenty of places you can go here to get some useful insight to help with your favorites when you battle with them.