Every Single Fire starter for D rank. I honestly can not think of a single thing these guys do that Growlithe doesnt do better. Growlithe himself is outclassed by Ponyta, both of which i'll discuss further on, so that should say something. about just how little they do. Notable exceptions to that statement and why they hardly matter are explained in order of generation:
Charmander - has access to Dragon Dance, which remedies his barely on par speed and sub par attack stats to give him the ability to sweep. Kind of. Any other viable Dragon Dancer completely outspeeds and out damages it. oh you're also relying on Flare blitz to put out any notable damage output which means (especially with a LO - which is mandatory else you'll be tickling bulkier mons like) it'll ultimately kill itself before doing anything interesting. Mix all that with Stealth rock weakness and you basically have a sweeper that has a small possibility of sweeping in less situations with more dedicated support than other choices (going to be nice and not even bring up scraggy) like totodile.
Cyndaquil - Gets eruption, which would be cool if it wasnt so stealth rock weak and reliant on choice scarf to get the eruption off. Unlike his big brother, and especially in a teir full of eviolite, the damag boost of specs / LO is really wanted. Obviously LO counter productive too
Torchic - its niche is being the *only* fire type baton passer. Aside from baton passing being a relatively unused strategy, why you would want a typing weak to rock in a Baton chain is beyond me. especially since it doesn't provide any notable stat bonuses more reliable / durable passers provide
Chimchar - The only fire starter to have a decent, and unique move pool and its backed by incredibly medicore stats. Honestly. It gets Stealth rock, making it fairly unique in that aspect; and according to the site it makes a "great lead." And while that is a fairly good point, my response is why are you using a lead in gen 5? Ignoring that; It's ability as a mixed attacker is limited due to its sub par attacking stats. in order to do any real damage with it, you'll need to invest heavily in both stats, leaving you outsped by basically everything. Why do this to yourself? just run Ponyta.
Tepig - It gets superpower, wild bolt, and Head smash 3 very powerful moves, yeah. Growlithe gets close combat and Wild bolt - which cover Fire's two most common switch-ins (water and rock), and has the freedom to take an item thats not a choice scarf. oh and it has higher stats in everything except HP and Defense (where it ties and has intimidate to improve it). Ponyta also gets wild charge and has even higher stats than Growlith.
The fire starts are just bad. Like bad to the point where if i see them in team preview I look at it and say "thats a free kill." I never worry about thm and everything they can do is just completely outclassed by other mons. All get D teir imo. Onto mons I do like:
Aside from having 100% of the appeal of your first dog, growlithe is actually pretty decent. Unfortunetly it is pretty much outclassed by Ponyta. It does function very well as a wall breaker with its amazing coverage moves decent Atk stat. It also gets morning sun and Intimidate, making a bulky attacker variant with eviolite totally plausible. I feel its a solid C mon