Pokémon Peridot Version walkthrough
13 parts, one per checkpoint Pokémon Peridot Version’s own documentation defines: the areas each one opens, the wild Pokémon and trainers in them, and the fight at the end of it. Everything here is read off the game’s own files, so anything it doesn’t state isn’t claimed.
Part 1: Elkhorn Town — the start
5 areas · 20 trainers · Rival (fight 1) — if you chose Squirtle, Rival (fight 1) — if you chose Bulbasaur, Rival (fight 1) — if you chose Charmander and 3 more
Part 2: Pectinia City — Murphy and the Fist Badge
13 areas · 44 trainers · Rival Mike (fight 1) — if you chose Squirtle, Rival Mike (fight 1) — if you chose Bulbasaur, Rival Mike (fight 1) — if you chose Charmander and 7 more
Part 3: Ridge Village — Cecil and the Wave Badge
4 areas · 29 trainers · Rival Mike (fight 2) — if you chose Squirtle, Rival Mike (fight 2) — if you chose Bulbasaur, Rival Mike (fight 2) — if you chose Charmander and 10 more
Part 4: Favia Town — Celeste and the Mystic Badge
17 areas · 31 trainers · Celeste (party 1: your first visit), Pokémon Trainer Emily, Celeste (party 2: rematch 1) and 4 more
Part 5: Hepatica Town — Duane and the Skull Badge
19 areas · 44 trainers · Rival Mike (fight 3) — if you chose Squirtle, Rival Mike (fight 3) — if you chose Bulbasaur, Rival Mike (fight 3) — if you chose Charmander and 8 more
Part 6: Staghorn Town — Posey and the Root Badge
15 areas · 41 trainers · Pokémon Trainer Emily 2, Posey (party 1: your first visit), Posey (party 2: after reaching Rugosa City) and 5 more
Part 7: Rugosa City — Joel and the Cog Badge
8 areas · 20 trainers · Rival Mike (fight 4) — if you chose Squirtle, Rival Mike (fight 4) — if you chose Bulbasaur, Rival Mike (fight 4) — if you chose Charmander and 6 more
Part 8: Carnation Town and the Safari Zone
11 areas · 10 trainers · Pokémon Trainer Emily 3
Part 9: Acropora City — Alan and the Glacier Badge
27 areas · 37 trainers · Rival Mike (fight 5) — if you chose Squirtle, Rival Mike (fight 5) — if you chose Bulbasaur, Rival Mike (fight 5) — if you chose Charmander and 6 more
Part 10: Orchid City — Enya and the Rising Badge
5 areas · 23 trainers · Rival Mike (fight 6) — if you chose Squirtle, Rival Mike (fight 6) — if you chose Bulbasaur, Rival Mike (fight 6) — if you chose Charmander and 6 more
Part 11: The sea routes, the Argent Depths and the S.S. Mako
63 areas · 168 trainers · Champion Joseph, years earlier, Ai Prof. Maple, Ai Prof. Maple 2 and 8 more
Part 12: Victory Coast and the Pokémon League
9 areas · 38 trainers · Elite Four Wilbur, Elite Four Regan, Elite Four Brede and 27 more
Part 13: Post-game — Route 24, Boreas Forest and the islands
9 areas · 3 trainers · Rival Mike (last fight)
This game's documentation doesn't say where 10 of its 518 fights happen, so those trainers are on no part of this walkthrough; they are all on the Trainers page.