Nuzlocke in Pokémon Ruby
I chose Ruby to do this run in for a few reasons. One is I had barely nuzlocked a gen 3 game before and two, I was and still am doing a series of nuzlockes through generations. Decided to post this one here since it was one of my most fun gen 3 runs. I'm not gonna go into detail on the whole run here, as I've already finished it and quite a lot of things happened, but I'll try to highlight the most important or memorable moments.
As rules for this run I used the basic nuzlocke rules, in addition to set mode and forced level caps for gyms and the champion.
I chose Mudkip and because of that the first gym wasn't much of a challenge. Water Gun one shot Geodude and finished Nosepass quite easily. I also caught a Shroomish in the woods which I trained up, as well as a Whismur in Route 116. I leveled up my Wurmple for Brawly and beat him with the evolved Dustox's Confusion.
Wattson's fight was pretty standard. Marshtomp had evolved and learned Mud Shot so it took only a couple of turns. On my way through Route 112 I also caught a Numel, and in Meteor Falls I caught a Solrock. Added both to my team.
In the Maxie fight up on Mt. Chimney Marshtomp got hit a bit too hard by Maxie's Camerupt and died after a burn damage. That sucked. I had to use solely Numel and Solrock for the Flannery fight, and it worked.
As I got my 4th badge the desert part was unlocked and I caught a Baltoy before it managed to explode. It was also time to fight my dad Norman, so I taught Breloom Bulk Up to set up on his face. I used the first Slaking as fodder and got to +6 attack, which helped me beat him easily. Upon unlocking Surf I got a Wingull in one of the water routes as a Water-type replacement, and also got a Voltorb in New Mauville to help me against the upcoming major fights.
Once I trained up my new members and went through Route 119 I challenged Winona and swept her with Ice Beam Pelipper and Thunderbolt Electrode. This next route is also where I lost my Solrock due to a surprise Crunch from a trainer's Seviper, and replaced it with my Baltoy. I took care of Team Magma and reached Mossdeep, where I challenged the twins with a Surf + Shadow Ball combo. They only have 2 Pokémon in Ruby and Sapphire, so I managed to avoid that scary fight from Emerald.
I beat team Magma once again and defeated Groudon with a Cosmic Power Claydol (I'm also not allowing legendaries in this run). Wallace wanted to fight me so I pulled off another Bulk Up Breloom sweep.
Once I finished victory road and fought Wally with minimal issues, I reached the league. After grinding and sorting out the movesets I went in.
Sidney was easy as he was pretty underleveled and I had a Breloom. Phoebe gave me PP issues, but I had a Shadow Ball Exploud that helped wall her Ghosts while dealing massive damage. I also used Breloom for Glacia which was... admitedly risky. But it worked as I didn't miss a single Sky Uppercut. I thought I'd sweep Drake with Ice Beam, but when his Salamence came he got a crit Dragon Claw on Exploud and killed it... I manged to finish him off with Pelipper's Ice Beam.
Steven was up next. Electrode OHKOed Skarmory with Thunderbolt, Pelipper KOed Armaldo, Aggron and Claydol with Surf, and Cradily with Ice Beam (Pelipper putting in work) and as Metagross came out I switched in Camerupt to finish it off with Flamethrower. As it turns out, and I forgot, his Metagross had Earthquake, which killed Camerupt in one hit. I brought in Claydol as my next plan and took it out with a few Earthquakes. The Ruby nuzlocke was done, and I had 4 deaths total.
Surviving Team

Breloom (Enoki) | Jolly nature | Effect Spore
Moves: Sky Uppercut, Mach Punch, Bulk Up, Leech Seed
Lv. 56

Claydol (Defused) | Sassy nature | Levitate
Moves: Psychic, Earthquake, Ice Beam, Cosmic Power
Lv. 55 @ Never-Melt Ice

Pelipper (Rood) | Sassy nature | Keen Eye
Moves: Surf, Wing Attack, Ice Beam, Fly
Lv. 56 @ Mystic Water

Electrode (Nhonho) | Quirky nature | Soundproof
Moves: Thunderbolt, Spark, Flash, Light Screen
Lv. 55 @ Lax Incense
Deaths (4)

Magnitude 9 into burn damage from Maxie's Camerupt

Crunch from a Seviper

Crit Dragon Claw from Drake's Salamence

Earthquake from Steven's Metagross
Current Bingo Sheet: