Also, if I ever feel like an utter masochist, this post exists to archive Smogon's NU tier for RSE.

[guardians_song]

See, someone started a NU Pokemon White Nuzlocke (but never finished it), so I'm thinking that, if I ever get to Nuzlocking RSE and a sane Ruby run bored me, I could always switch to Sapphire and use it as motivation to go do work as something less painful challenge myself by doing the same thing.

Aipom
Ariados
Beautifly
Beedrill
Butterfree
Castform
Chimecho
Corsola
Crawdaunt
Delcatty
Delibird
Dewgong
Ditto
Dustox
Farfetch'd
Furret
Girafarig
Glalie
Huntail
Illumise
Kecleon
Ledian
Lickitung
Luvdisc
Magcargo
Masquerain
Mawile
Mightyena
Minun
Murkrow
Noctowl
Nosepass
Parasect
Pelipper
Pidgeot
Piloswine
Plusle
Raticate
Relicanth
Roselia
Seaking
Spinda
Sudowoodo
Sunflora
Swalot
Togetic
Torkoal
Trapinch
Tropius
Unown
Venomoth
Volbeat
Wailord
Whiscash
Wigglytuff
...Do note that Zigzagoon's evolution is NOT on this list. As such, I may or may not choose to use Dupes Clause in this hypothetical run.

Those that can be CAUGHT in RS:


Route 101
[...]
Poochyena (Grass) Some
Wurmple (Grass) Many

========================
Route 103
========================
[...]
Pelipper (Surfing) Few
Poochyena (Grass) Some
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)
Wingull (Grass & Surfing) Many

========================
Route 102
========================
[...]
Corphish (Fishing) Some(Good Rod) & Many(Super Rod)
Goldeen (Fishing) Some(Old & Good Rod)
Poochyena (Grass) Some
Surskit (Grass) Few
Wurmple (Grass) Some

========================
Petalburg City
========================
This area is small. Pokemon can be found by Fishing & Surfing.
Corphish (Fishing) Some(Good Rod) & Many (Super Rod)
Goldeen (Fishing) Some(Old & Good Rod)
[...]

========================
Petalburg Woods
========================
[...]
Cascoon (Grass) Some
Silcoon (Grass) Some
Wurmple (Grass) Some

========================
Route 104
========================
[...]
Pelipper (Surfing) Few
Wingull (Grass & Surfing) Many
Wurmple (Grass) Some

========================
Rustboro City
========================

========================
Route 116
========================
[...]
Skitty (Grass) Few

========================
Rusturf Tunnel
========================
[...]

========================
Route 105 & Island Cave
========================
[...]
Pelipper (Surfing) Few
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)
Wingull (Surfing) Many

========================
Dewford Town & Route 106
========================
[...]
Pelipper (Surfing) Few
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)
Wingull (Surfing) Many

========================
Granite Cave
========================
This area is large. Pokemon can be found by walking in the cave & using
Rock Smash.
[...]
Mawile (B1F & B2F) Some(Ruby Only)
Nosepass (B2F) Some(Rock Smash)

========================
Route 107
========================
[...]
Pelipper (Surfing) Few
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)
Wingull (Surfing) Many

========================
Route 108
========================
[...]
Pelipper (Surfing) Few
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)
Wingull (Surfing) Many

========================
Abandoned Ship
========================
[...]

========================
Route 109
========================
[...]
Pelipper (Surfing) Few
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)
Wingull (Surfing) Many

========================
Slateport City
========================
[...]
Pelipper (Surfing) Few
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)
Wingull (Surfing) Many

========================
Route 110 & Cycling Road
========================
[...]
Gulpin (Grass) Some
Minun (Grass) Some(Ruby) & Few(Sapphire)
Pelipper (Surfing) Few
Plusle (Grass) Few(Ruby) & Some(Sapphire)
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)
Wingull (Grass & Surfing) Many

========================
New Mauville
========================
[...]

========================
Route 117
========================
[...]
Corphish (Fishing) Some(Good Rod) & Many (Super Rod)
Goldeen (Fishing) Some(Old & Good Rod)
Illumise (Grass) Some(Ruby) & Few(Sapphire)
Roselia (Grass) Some
Surskit (Grass) Few
Volbeat (Grass) Few(Ruby) & Some(Sapphire)

========================
Route 111 & Desert Ruins
========================
[...]
Barboach (Fishing) Some(Good Rod) & Many(Super Rod)
Goldeen (Fishing) Some(Old & Good Rod)
Surskit (Fishing & Surfing) Few
Trapinch (Sand/Desert) Many

========================
Route 112
========================

========================
Firey Path
========================
[...]
Torkoal (Cave Floor) Some
Slugma (Cave Floor) Some

========================
Route 113
========================
[...]
Spinda (Grass) Many

========================
Route 114
========================
[...]
Barboach (Fishing) Some(Good Rod) & Many(Super Rod)
Goldeen (Fishing) Some(Old & Good Rod)
Surskit (Fishing & Surfing) Few

========================
Meteor Falls
========================
[...]
Barboach (Fishing) Some(Good Rod) & Many(Super Rod)
Goldeen (Fishing) Some(Old & Good Rod)
Whiscash (Ground Floor & 1F) Some(Super Rod)

========================
Route 115
========================
[...]
Jigglypuff(Grass) Some
Wailmer (Fishing) Some(Good Rod) & Many (Super Rod)
Wingull (Grass & Surfing) Many

========================
Jagged Pass
========================
[...]

========================
Lavaridge Town
========================
[...]

========================
Route 118
========================
[...]
Pelipper (Surfing) Few
Wingull (Grass & Surfing) Many

========================
Route 119
========================
[...]
Pelipper (Surfing) Few
Tropius (Grass) Few
Wingull (Grass & Surfing) Many
Kecleon (Grass) Few

========================
Weather Institute
========================
[...]
Castform (Received when you run out Team Aqua/Magma) Only One

========================
Fortree City
========================
Skitty Exchange for a Pikchu

========================
Route 120
========================
[...]
Barboach (Fishing) Some(Good Rod) & Many(Super Rod)
Goldeen (Fishing) Some(Old & Good Rod)
Kecleon (Find with Devon Scoop) Few
Surskit (Tall Grass) Few

========================
Route 121
========================
[...]
Wingull (Grass) Many

========================
Safari Zone
========================
[...]
Girafarig (Southeast & Southwest) Some
Goldeen (Fishing) Some(Old Rod) Many(Good & Super
Rod)
Seaking (Northwest & Southwest) Some(Super Rod)

========================
Route 122 & Mt. Pyre
========================
[...]
Chimecho (Summit) Few
Pelipper (Surfing) Few
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)
Wingull (Grass & Surfing) Many

========================
Route 123
========================
[...]
Pelipper (Surfing) Few
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)
Wingull (Grass & Surfing) Many

========================
Lilycove City
========================
[...]
Pelipper (Surfing) Few
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)
Wingull (Surfing) Many

========================
Team's Hideout
========================
[...]
========================
Route 124
========================
[...]
Clamperl (Ocean Floor) Many
Pelipper (Surfing) Few
Relicanth (Ocean Floor) Few
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)
Wingull (Surfing) Many

========================
Mossdeep City
========================
[...]
Pelipper (Surfing) Few
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)
Wingull (Surfing) Many

========================
Route 125 & Shoal Cave
========================
[...]
Pelipper (Surfing) Few
Relicanth (Ocean Floor) Few
Snorunt (Cave B2F in small Ice Room) Some
[I MAY ONLY CATCH MALES]
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)
Wingull (Surfing) Many

========================
Route 127
========================
[...]
Pelipper (Surfing) Few
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)
Wingull (Surfing) Many

========================
Route 128
========================
[...]
Corsola (Fishing) Some(Super Rod)
Luvdisc (Fishing) Some(Good Rod) & Many(Super Rod)
Pelipper (Surfing) Few
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)
Wingull (Surfing) Many

========================
Seafloor Cavern
========================
[...]
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)

========================
Route 126
========================
[...]
Clamperl (Ocean Floor) Many
Pelipper (Surfing) Few
Relicanth (Ocean Floor) Few
Wailmer (Fishing) Some (Good Rod) & Many (Super Rod)
Wingull (Surfing) Many

========================
Sootopolis City
========================
[...]

========================
Cave of Origin
========================
[...]
Mawile (Ground Floor, B1F, B2F, & B3F) Some(Ruby Only)

========================
Route 129
========================
[...]
Pelipper (Surfing) Few
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)
Wailord (Surfing) Few
Wingull (Surfing) Many

========================
Route 130 & Mirage Island
========================
[...]
Pelipper (Surfing) Few
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)
Wingull (Surfing) Many

========================
Pacifidlog Town & Route 131
========================
[...]
Pelipper (Surfing) Few
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)
Wingull (Surfing) Many
Wingull (Surfing) Many

========================
Route 132
========================
[...]
Pelipper (Surfing) Few
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)
Wingull (Surfing) Many

========================
Route 133
========================
[...]
Pelipper (Surfing) Few
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)
Wingull (Surfing) Many

========================
Route 134
========================
[...]
Pelipper (Surfing) Few
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)
Wingull (Surfing) Many

========================
Ever Grande City
========================
[...]
Corsola (Fishing) Some(Super Rod)
Luvdisc (Fishing) Some(Good Rod) & Many(Super Rod)
Pelipper (Surfing) Few
Wailmer (Fishing) Some(Good Rod) & Many(Super Rod)
Wingull (Surfing) Many

========================
Victory Road
========================
[...]
Barboach (Fishing) Some(Good Rod) Many(Super Rod)
Goldeen (Fishing) Some(Old & Good Rod)
Mawile (B2F) Many(Ruby Only)
Whiscash (B2F) Some(Super Rod)

========================
Sky Pillar
========================
[...]
Mawile (Ground Floor, 2F, & 4F) Some(Ruby Only)
(list edited down from Moviebuff2287's Pokemon Locations FAQ)

In short, I would only get to use the following 34 Pokemon.

Beautifly
Castform
Chimecho
Corsola
Crawdaunt
Delcatty
Dustox
Girafarig
Glalie
Huntail
Illumise
Kecleon
Luvdisc
Magcargo
Masquerain
Mawile [ONLY IN RUBY]
Mightyena
Minun
Nosepass
Pelipper
Plusle
Relicanth
Roselia
Seaking
Spinda
Swalot
Torkoal
Trapinch
Tropius
Volbeat
Wailord
Whiscash
Wigglytuff

Without Dupes Clause, I'd only be guaranteed:
========================
Route 102
========================
[...]
Corpish (Super Rod)
Goldeen (Good Rod)
Poochyena, Surskit, or Wurmple (Walking)

========================
Petalburg City
========================
Corpish (Super Rod)
Goldeen (Good Rod)

========================
Petalburg Woods
========================
[some Wurmple evolution]

========================
Route 116
========================
Skitty

========================
Granite Cave
========================
Mawile [RUBY ONLY]
Nosepass (Rock Smash)

========================
Route 117
========================
[...]
Corpish (Super Rod)
Goldeen (Good Rod)
Illumise, Roselia, Surskit, Volbeat (Walking)

========================
Route 111 & Desert Ruins
========================
[...]
Barboach, Goldeen, Surskit (Fishing)
Surskit (Surfing)
Trapinch (Sand/Desert)

========================
Fiery Path
========================
Torkoal or Slugma.

========================
Route 113
========================
Spinda

========================
Route 114
========================
Goldeen (Old Rod)
Barboach evo (Super Rod)
Surskit (Surfing)

========================
Meteor Falls
========================
Goldeen (Old Rod)
Barboach evo (Super Rod)

========================
Weather Institute
========================
Castform mandated by plot.

========================
Fortree City
========================
Skitty Exchange for a Pikachu (?)

========================
Route 120
========================
[...]
Corpish (Super Rod)
Goldeen (Good Rod)
Kecleon (Find with Devon Scope)
Surskit (Tall Grass)

========================
Route 121
========================
Wingull

========================
Safari Zone
========================
Girafarig (Southeast & Southwest) on land, and Goldeen or Seaking with fishing.

========================
Route 122 & Mt. Pyre
========================
[...]
Chimecho (Summit) Few
Wingulls and Wailmers (everywhere else)

========================
Route 124
========================
[...]
Clamperl or Relicanth (Ocean Floor)
Wingulls and Wailmers (everywhere else)

========================
Route 125 & Shoal Cave
========================
[Elsewhere]
Relicanth (Ocean Floor)
Wingulls and Wailmers (everywhere else)

[Cave]
Snorunt (Cave B2F in small Ice Room) Some
[I MAY ONLY CATCH MALES]

========================
Seafloor Cavern
========================
Wailmer (Fishing)

========================
Route 126
========================
[...]
Clamperl (Ocean Floor) Many
Relicanth (Ocean Floor) Few
Wingulls and Wailmers (everywhere else)

========================
Cave of Origin
========================
Mawile [RUBY ONLY]

========================
Ever Grande City
========================
[...]
Corsola, Luvdisc, or Wailmer (Super Rod)
Wingull evos (surfing)

========================
Victory Road
========================
Goldeen (Old Rod)
Barboach evo (Super Rod)
Mawile (Ground) [RUBY ONLY]

========================
Sky Pillar
========================
[...]
Mawile (Ground Floor, 2F, & 4F) Some(Ruby Only)


========================
Route 104, Route 105 & Island Cave, Dewford Town & Route 106, Route 107, Route 108, Slateport City, Route 118, Route 123, Lilycove City, Mossdeep City, Route 127, Route 129, Route 130 & Mirage Island, Pacifidlog Town & Route 131, Route 132, Route 133, Route 134
========================
WINGULL EVO IF SURFING OR WALKING, WAILMER IF FISHING
(Wailord possible on Route 129)

...In short, in a Dupes-Clause-Off run, I would live off of Pelipper, Wailord, Glalie, Seaking, Whiscash, Crawdaunt, a Wurmple evolution, Delcatty, Nosepass, Trapinch (UNEVOLVED), Masquerain, Spinda, Torkoal/Magcargo, Castform, Kecleon, Girafarig, Chimecho, and Relicanth. Any more team members would be sheer good fortune.

19 Pokemon, and all of them officially at the bottom of the barrel, competitive-play-wise. And almost all of them mortal bait for Wattson.

*in monotone voice* Oh, boy. This would be FUN.
[It's better than the FR/LG equivalent, though. Try using only Beedrill, Butterfree, Dewgong, Ditto, Farfetch'd, Lickitung, Parasect, Pidgeot, Raticate, Seaking, Venomoth, Wigglytuff to get you through the entire game... though I remember one crazy bastard solo'ing Emerald with a Rattata, so anything can be done, really.]

I'm not playing it NOW, obviously, since I have a lot to do. I just wanted to work out the practicalities, because I have a fondness for working out a lot of theoretical nonsense because I tend to either botch the application or wind up wanting to desperately do something else. Besides, it took my mind off... said stuff I have to do. :\