Alright, time to drop my Mono-Bug Tier List. As someone with plenty of experience in the field and a 19,000 word google doc on Bug Monotype (Yes this is true. I'm around 5% done. Yes I have autism. Yes I will send to those who ask.) I feel qualified to make some nominations.
Word of warning: I am VERY open to niche sets and mons, so don't be suprised if you see any shitmons in these tiers.
S Tier
Volcarona
Scizor
Kleavor
All self explanatory.
A Tier
Araquanid
Forretress
Slither Wing - for its ability to break Steel-type teams, as well as function as a defensive pivot with AV or boots Morning Sun, which Lokix cannot do, I think it should be A. Being a burn spreader also helps this a TON, as Volcarona can rarely afford to run Will-o-Wisp. I can't possibly see a reason for this not to be in A
Ribombee - this is a fantastic lead into Dragon, Poison, and Fighting-type teams, as well as ensuring Sticky Web gets up earlygame better than any other Pokemon other than arguably Araquanid who excels in different matchups. It can also use a ton of random moves like Skill Swap to own Gliscor and Psychic Noise to piss off walls.
B Tier
Galvantula
Frosmoth - overrated IMO. It's a Quiver Dance sweeper that does nothing into Steel and Water. It also struggles to output meaningful damage into neutral targets due to being much slower and weaker than Volcarona. Still solid, but blanking into Steel and Water hurts really bad. Also only has one real set which does hurt its viability for me.
Lokix - First Impression hits hard but being an offensive pivot that doesn't run Boots on a Rock-weak team is unfortunate. Also, its attacks don't deal nearly as much as they should in a world without tera to justify its abysmal bulk and lack of any defensive utility.
Heracross - this guy is underrated. Guts AND Moxie are both solid abilities and being able to check Toxapex and Archaludon as a physical attacker with Guts is awesome. Moxie is good if you want a second Scarf Kleavor on a team and sweeps surprisingly often.
Yanmega
C Tier
Vikavolt
Vivillion
Scyther - genuinely not too bad of a mon. Has STAB Technician Dual Wingbeat along with Swords Dance to cosplay as Scizor and Yanmega's one night stand baby. Eviolite makes it surprisingly bulky and it has Scizor's movepool which is sick because Close Combat is a fantastic coverage option.
D Tier
Rabsca - this dude is ASS. Literally run anything over him.
Venomoth
Word of warning: I am VERY open to niche sets and mons, so don't be suprised if you see any shitmons in these tiers.
S Tier
Volcarona
Scizor
Kleavor
All self explanatory.
A Tier
Araquanid
Forretress
Slither Wing - for its ability to break Steel-type teams, as well as function as a defensive pivot with AV or boots Morning Sun, which Lokix cannot do, I think it should be A. Being a burn spreader also helps this a TON, as Volcarona can rarely afford to run Will-o-Wisp. I can't possibly see a reason for this not to be in A
Ribombee - this is a fantastic lead into Dragon, Poison, and Fighting-type teams, as well as ensuring Sticky Web gets up earlygame better than any other Pokemon other than arguably Araquanid who excels in different matchups. It can also use a ton of random moves like Skill Swap to own Gliscor and Psychic Noise to piss off walls.
B Tier
Galvantula
Frosmoth - overrated IMO. It's a Quiver Dance sweeper that does nothing into Steel and Water. It also struggles to output meaningful damage into neutral targets due to being much slower and weaker than Volcarona. Still solid, but blanking into Steel and Water hurts really bad. Also only has one real set which does hurt its viability for me.
Lokix - First Impression hits hard but being an offensive pivot that doesn't run Boots on a Rock-weak team is unfortunate. Also, its attacks don't deal nearly as much as they should in a world without tera to justify its abysmal bulk and lack of any defensive utility.
Heracross - this guy is underrated. Guts AND Moxie are both solid abilities and being able to check Toxapex and Archaludon as a physical attacker with Guts is awesome. Moxie is good if you want a second Scarf Kleavor on a team and sweeps surprisingly often.
Yanmega
C Tier
Vikavolt
Vivillion
Scyther - genuinely not too bad of a mon. Has STAB Technician Dual Wingbeat along with Swords Dance to cosplay as Scizor and Yanmega's one night stand baby. Eviolite makes it surprisingly bulky and it has Scizor's movepool which is sick because Close Combat is a fantastic coverage option.
D Tier
Rabsca - this dude is ASS. Literally run anything over him.
Venomoth