Second playthrough in hard mode and wanted to try some things here. 
Poliwrath which is definitely the best here. Karate chop and bubble beam as early moves breezes through early game. And then easy set up with Hypnosis-Amnesia late game to sweep most of e4. Felt guilty on using this combo. Definitely better than Golduck because of how hypnosis makes setting up easier. While Golduck still has merit in having better stats from get go and just amnesia when needed.
Jolteon with focus energy-jump kick-tbolt-twave. Which I think is overkill for most of the run. Helped me on Lorelei for some sure crit tbolts. 
Pinsir is such a beast, took some time to get him as I was getting unlucky. But man, he did so much work, and maybe more than Jolteon because of how much damage even just 1 swords dance and twin needle late game does specially when he got his stat exp, sweeping the late game trainers with ease.
Onix shockingly is very good due to how much stat buffs he got in legacy. Definitely close to Golem and Rhydon's performance now, though he's missing some dmg a bit but it makes up for how fast he can get with the stat exp, ending up almost sweeping Agatha for me. Also definitely so much tankier now. 
Vileplume is really lackluster, specially when compared to Venusaur and Victreebel. Vileplume has some bulk but the typing just doesn't help it so if it ends up missing a sleep powder, can definitely end up dead. 
Lastly, Pidgeot as the worst performer. Man, this is sad to say since it's my favorite bird since day 1 but late evo and even with stat exp it hardly does things. Good thing he gets sky attack later which makes it serviceable. But definitely can't even sweep Bruno. 

Anyways, I would like to thank the dev team so much for such a wonderful experience. I've played yellow before and can say this hack really brings it to justice. 
The tier list is really accurate, but I think Pinsir deserves a higher ranking there. Onix is accurate since it just a bit below both Golem and Rhydon. Now I'm planning to try a 3rd play 
through with now much worse Pokemons : Farfetchd, Butterfree, Marowak, Arbok, Wigglytuff and Seaking.

Sharing my second YL team playthrough