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Pokemon Red and Blue Routes 5 and 6 with Underground Path Walkthrough

Thunder Badge

Routes 5 and 6 with Underground Path section for the Pokemon Red and Blue walkthrough with wild Pokemon, trainers, items, hidden items, coordinates, and boss strategy.

By Damodar Sharma Updated June 19, 2026 Walkthrough

Use the Underground Path to reach Vermilion while Saffron's guards block the direct gates. This page is a standalone section for Phase 3: Thunder Badge, with source-backed Red/Blue encounter, trainer, item, hidden item, and boss data.

Source maps

Route 5, Underground Path North South, Underground Path Route 5, Underground Path Route 6, and Route 6.

Wild rows15 Trainers6 Items2

Route plan

Route 6 has several avoidable double-line trainers; clear them for Surge levels or save them for later.

Wild Pokemon

Version

Each area below has its own table, split by encounter method. Red/Blue has no time-of-day mechanic, so every method uses a single rate column, and the R/B chips show which version each row applies to. Tall grass, cave, and Surf rates merge every base slot for a species out of the Gen I ten-slot table: 51/256, 51/256, 39/256, 25/256, 25/256, 25/256, 13/256, 13/256, 11/256, and 3/256. Fishing, gift, trade, prize, and static rows keep their own labeled rates.

Route 5

Route 5 wild Pokémon by method, games, levels, encounter rate, and requirements
PokémonGamesLevelsRateNotes
Tall grass / cave floor
Pidgey Red and Blue sprite Pidgey RB13-1640%—
Oddish Red and Blue sprite Oddish RB13-1635%—
Bellsprout Red and Blue sprite Bellsprout RB13-1635%—
Mankey Red and Blue sprite Mankey RB10-1625%—
Meowth Red and Blue sprite Meowth RB10-1625%—

Route 6

Route 6 wild Pokémon by method, games, levels, encounter rate, and requirements
PokémonGamesLevelsRateNotes
Tall grass / cave floor
Pidgey Red and Blue sprite Pidgey RB13-1640%—
Oddish Red and Blue sprite Oddish RB13-1635%—
Bellsprout Red and Blue sprite Bellsprout RB13-1635%—
Mankey Red and Blue sprite Mankey RB10-1625%—
Meowth Red and Blue sprite Meowth RB10-1625%—
Fishing — Old Rod
Magikarp Red and Blue sprite Magikarp RB5100%Any fishable water tile.
Fishing — Good Rod
Goldeen Red and Blue sprite Goldeen RB1050%Any fishable water tile after getting Good Rod.
Poliwag Red and Blue sprite Poliwag RB1050%Any fishable water tile after getting Good Rod.
Fishing — Super Rod
Krabby Red and Blue sprite Krabby RB1550.0%Super Rod group 4.
Shellder Red and Blue sprite Shellder RB1550.0%Super Rod group 4.

Trainers

Route order Trainer Team Reward Optional / rematch note
1. Route 6 (10, 21)Jr. Trainer M trainer spriteJr. Trainer MParty #4
Squirtle Red and Blue sprite Squirtle Lv. 20
$400One-time trainer; no rematch in Red/Blue.
2. Route 6 (11, 21)Jr. Trainer F trainer spriteJr. Trainer FParty #2
Rattata Red and Blue sprite Rattata Lv. 16 Pikachu Red and Blue sprite Pikachu Lv. 16
$320One-time trainer; no rematch in Red/Blue.
3. Route 6 (0, 15)Bug Catcher trainer spriteBug CatcherParty #10
Weedle Red and Blue sprite Weedle Lv. 16 Caterpie Red and Blue sprite Caterpie Lv. 16 Weedle Red and Blue sprite Weedle Lv. 16
$160One-time trainer; no rematch in Red/Blue.
4. Route 6 (11, 31)Jr. Trainer M trainer spriteJr. Trainer MParty #5
Spearow Red and Blue sprite Spearow Lv. 16 Raticate Red and Blue sprite Raticate Lv. 16
$320One-time trainer; no rematch in Red/Blue.
5. Route 6 (11, 30)Jr. Trainer F trainer spriteJr. Trainer FParty #3
Pidgey Red and Blue sprite Pidgey Lv. 16 Pidgey Red and Blue sprite Pidgey Lv. 16 Pidgey Red and Blue sprite Pidgey Lv. 16
$320One-time trainer; no rematch in Red/Blue.
6. Route 6 (19, 26)Bug Catcher trainer spriteBug CatcherParty #11
Butterfree Red and Blue sprite Butterfree Lv. 20
$200One-time trainer; no rematch in Red/Blue.

Items And Hidden Items

Item Type Area / direction Coordinate Requirement
Full RestoreHidden itemHidden on the searchable tile at (3, 4) in Underground Path North South.(3, 4)Press A on the hidden tile or use the Itemfinder nearby.
X SpecialHidden itemHidden on the searchable tile at (4, 34) in Underground Path North South.(4, 34)Press A on the hidden tile or use the Itemfinder nearby.

Boss Strategy

No boss or Rival branch is attached to this section.

Completion Checklist

  • Search Underground Path hidden items.
  • Clear Route 6 trainers.
  • Catch version exclusives before Vermilion if desired.
  • Verify the wild table's version splits before leaving if you are filling the Pokedex.
  • Use the item rows as a visible-item and hidden-item sweep before moving to the next section.

Sources

  • pret/pokered: wild encounters, trainer parties, trainer money, map object events, hidden event items, rods, trades, and prize Pokemon.
  • Encounter odds aggregate the Gen I ten-slot rates: 51/256, 51/256, 39/256, 25/256, 25/256, 25/256, 13/256, 13/256, 11/256, and 3/256.
  • Red/Blue has no day/night encounter column; tables group each area by encounter method with R/B game chips and a single merged Rate column.

Related articles

Pokemon Red and Blue Walkthrough HubPhase 3: Thunder BadgePrevious: Cerulean GymNext: Vermilion City and S.S. Anne