As the pokemon earns EXP points, it loses the ability to get more stat enhancers, and I think we're getting off topic.
LexDrake, Typhlosion has great speed! It's not as fast as Sceptile, but it's still fast!
Ho-Oh is the only fire-type legendary that's worth anything (unless you consider Groudon as a fire-type, it sort of is.) Moltres is pretty bad, and Entei sucks $h!t
The strongest is Ho-Oh. End of that story.
But here's what I think on non-Legends:
1) Blaziken
2) Charizard
3) Houndoom (I think he's stronger than 4, personally, plus I've always like Houndoom!)
4) Typhlosion
5) Arcanine
6) ...maybe either Magmar or Rapidash
7) which ever one didn't make 6.