Nuzlock help!

[Vohras]

I think you might be able to pull it off. I'll put the pokemon I'd recommend on the routes here. Your team is obviously going to be skewed pretty heavily towards water pokemon, given the remaining routes. I stopped posting repeats like halfway through, since most of the water areas are the same.

Route 120
Surfing - Azumarill, 66% chance
Tall Grass - Gloom, 40% chance
Tall Grass - ABsol, 5% chance
Horde - Oddish/Marril, 60/35% chance

Route 121
Grass/Tall Grass - Gloom/Shuppet, 30%
Horde - Shuppet, 60%

Route 122
Good Rod - Magikarp, 65%
Good Rod - Tentacool, 35%
Super Rod - Wailmer, 100%

Mt.Pyre
Tower - Shuppet, 65%
Tower - Duskull, 35%
Exterior - Vulpix, 15%
Exterior - Meditite, 40%

Magma Hideout
Fake item - Electrode, 100%
Surfing - Tentacool, 100%
Old Rod - Magikarp, 65%

Safari
Area 2 Tall Grass - Wobbufett, 20%
Area 2 Tall Grass - Gloom, 30%
Area 3 Grass - Rhyhorn, 20%
Area 3 Tall Grass - Heracross, 20%
Area 4 Grass - Donphan, 20%
Area 4 Tall Grass - Pinsir - 20%

Mossdeep
Super Rod - Wailmer, 100%

Shoal Cave
High Tide - Golbat, 40%
High Tide - Spheal/Sealeo, 60%
Ice room - Snorunt - 40%

Sootopolis
Surfing - Magikarp, 100%

Cave of Origin
Golbat - 69%
Ruby - Mawile, 31%
Sapphire - Sableye, 31%

New Mauville
Magnemite - 50%

Route 130/131/132
Super Rod - Horsea/Seadra, 40%

Victory Road
Entrance - Golbat, 20%
Entrance - Hariyama, 15%
Entrance - Mawile/Sableye, 10%
Entrance - Larion, 20%
Entrance - Medicham, 15%

Route 115 (In case you missed it by going through Meteor Falls)
Taillow - 40%
Swablu - 40%
Horde - Swablu - 100%