I believe Quilava could have a niche in the tier, though it currently is unmentioned. It doesn't have any movesets. I think it could be used as an offensive suicide. It is just barely under the speed of Monferno, which is used as a suicide lead. It doesn't have access to Stealth Rocks, but it does have powerful offensive moves. It has Eruption for anything it can manage to outspeed, and can use Overheat with focus sash to get a STAB boost and a Blaze boost, making it extremely powerful for one time use. It has access to Reversal when Overheat isn't effective and where fighting is supereffective, or in a pinch when its special attack is reduced. For a 4th move, it can use endure to try and give it another chance when hit by entry hazards, or it has quick attack to finish off other focus sash users and sturdy users. I have been testing this, so I'm not making it up off the top of my head with no experience.
I would be willing to write this analysis, though it may take me some time, but at the very least would hope that at least a moveset could be put up for it.
Offensive Suicide
Ability: Blaze
Item: Focus Sash
Naive Nature
8 Att / 252 SpA / 248 Spe
Overheat
Reversal
Eruption
Quick Attack / Endure
The speed IV to avoid ties with any Pokemon in the tier (Unfezant), which would be disastrous when trying to decide which move to use if picked wrong.
TL;DR Quilava could have an offensive suicide set