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>S Tier: Infernape, Swampert, Cinderace
Infernape is fantastic as long as you know your ranges and aren't playing blind. It will usually do fine as long as it is knocking things out, but the frailty can cost it dearly in a Nuzlocke setting. Swampert is a monster of an in-game mon. Can't comment on Cinderace.
>A Tier: Empoleon, Venusaur, Primarina, Delphox, Decidueye, Emboar
Piplup and Prinplup are legitimately bad, but Empoleon itself is exceptional. Think it is at best a B overall, but A is fair. Most of the others are alright, with the exception of Decidueye- slow an with a bad typing for it's game once fully evolved.
>>B Tier: Typhlosion, Torterra, Samurott, Blaziken, Chesnaught
Samurott is one of the rare Water-types available in BW1, which is a huge boon for it there, while Tepig is much more replaceable. Both are very solid and should still hang in the same tier. Torterra should absolutely be in A. not counting Candice and the league, it flattens the rest of Sinnoh, which is way better than Empoleon's Line musters. HGSS Typh is easily A tier due to early Fire Blast and Choice Specs.
>C Tier: Feraligatr, Blastoise, Rillaboom, Sceptile, Incineroar, Inteleon, Charizard, Greninja
Feraligatr is almost as strong in GSC as Swampert is in RSE, it has no business being any lower than A tier in Gen 2. Incineroar has a perfectly solid performance in SM(B-Tier, probably), but is the best Starter by a country-mile in USUM(S-tier perfomance).
>F Tier: Meganium, Serperior
They usually don't die in Nuzlockes and can live through most things, but they struggle with matchups and winning with them is slow going.