I personally feel that Typhlosion hasnt gotten enough credit for its own abilities. I would not be posting this thread without support, which is as follows:
Typhlosion has good base stats: 78 HP, 84 Atk, 78 Def, 109 Sp Atk, 85 Sp Def, 100 Spd.
With the base stats it has, it is cut out for special sweeping in higher tiers.
Typhlosion has a good move pool, including Fire, Psychic, Grass, Electric, normal, ghost, fighting, Ground, Dark, Rock, and even steel type moves, shown below (the best of each for the most part)
Fire- Eruption, Flare Blitz
Psychic- Extrasensory (HGSS)
Grass- Solar Beam
Electric- Thunder Punch
Normal- Headbutt, Hyper Beam, Double Edge
Ghost- Shadow Claw
Fighting- Focus Blast, Brick Break
Ground- Earthquake
Steel- Gyro Ball
Rock- Rock Slide, Rollout
Dark- Fling (chuck a flame orb at face?!)
There are no types that typhlosion cant do a single thing against (Dragons are usually flying in standard, thus rockslide is best, Water can be taken care of with thunderpunch or solar beam, steel by eruption, psychics by shadow claw, darks by focus Blast, Dark/Ghosts by a neutral eruption.) Sure, it has the weakness to stealth rock, but i dont think that alone is enough to knock it down to the BL tier. Typhlosion has the versatility to be a jack of all trades for a team that needs to cover two or more types at once. It also handles most Standard pokemon well (depending on moveset), and on serebii.net, apparently has a shallow move pool? 11/18 types isnt shallow to me... its not the deepest, but it isnt shallow by any means.