Phase 10 section
Pokemon Emerald Desert Underpass and Fossil Recovery Walkthrough
Desert Underpass and Fossil Recovery section for the Pokemon Emerald walkthrough with wild Pokemon, trainers, items, coordinates, requirements, and strategy notes.
Desert Underpass and Fossil Recovery is a dedicated section page for Phase 10: Post-Game + Battle Frontier. After the Hall of Fame, recover the fossil you did not choose in Mirage Tower.
Phase 10 asset set
Post-Game + Battle Frontier: S.S. Tidal, Battle Frontier, Frontier Brains, Steven, roaming Lati, and post-game dungeons.
Route Plan
Primary source maps covered here: Route 114 Fossil Maniacs Tunnel, Desert Underpass. Follow this page as its own checklist, then return to the phase index when the wild Pokemon, trainers, items, and boss notes are complete.
Wild Pokemon
Each area below has its own table, split by encounter method. A species row merges every slot that species occupies for the method, and rows sort by encounter rate. Emerald has no normal day/night wild encounter split, so every row applies at any time unless its note says otherwise (for example Shoal Cave tides or Altering Cave Mystery Gift tables). Underlying slot odds: grass/cave 20/20/10/10/10/10/5/5/4/4/1/1; Surf and Rock Smash 60/30/5/4/1; Old Rod 70/30; Good Rod 60/20/20; Super Rod 40/40/15/4/1.
| Pokémon | Levels | Rate | Notes |
|---|---|---|---|
| Grass / cave floor | |||
 Ditto | 38-45 | 50% | — |
 Whismur | 35-38 | 34% | — |
 Loudred | 38-44 | 16% | — |
Trainers
No mandatory trainer battles are sourced for this section.
Items
| Item | Type | Location | Requirement / flag context |
|---|---|---|---|
| Claw Fossil | Gift / reward | Desert Underpass, Give Claw Fossil | NPC gift or story reward |
| Root Fossil | Gift / reward | Desert Underpass, Give Root Fossil | NPC gift or story reward |
Completion Checklist
- Clear the main objective: After the Hall of Fame, recover the fossil you did not choose in Mirage Tower.
- Review every wild Pokemon method listed for the section.
- Fight or deliberately skip every trainer listed in route order.
- Collect visible items, hidden items, and scripted rewards you care about before moving on.
Source Notes
- Source of truth: pret/pokeemerald
wild_encounters.json, mapmap.jsonobject/background events, mapscripts.inc,trainers.h, andtrainer_parties.h. - Encounter rates merge every slot a species occupies within each method band from Emerald slot rates. Emerald has no normal day/night wild encounter split, so rows apply at any time unless their notes say otherwise.
- Pokemon table sprites use locally cached Emerald front sprites from
/guides/pokemon-emerald-pokemon-sprites.json.