Phase 1 section
Pokemon Diamond and Pearl Route 201 and Sandgem Town Walkthrough
Coal Badge Learn the catching loop, accept Rowan's Pokedex assignment, name the starter, and unlock the first supply run. Exact Diamond/Pearl encounters, every sourced trainer, visible and hidden items, puzzle notes, boss teams, and completion checks.
Phase 1 Coal Badge Twinleaf Town, Lake Verity, Sandgem, Jubilife, Oreburgh Gate, Oreburgh City, and Roark. 01 / 11 
Learn the catching loop, accept Rowan's Pokedex assignment, name the starter, and unlock the first supply run. This standalone section joins the route plan to the original Diamond/Pearl map, encounter, trainer, item, and script data; Platinum tables are not substituted.
Source maps
Route 201, Sandgem, Sandgem Poké Mart, Sandgem Pokémon Center, Sandgem Pokémon Center 2F, Sandgem Rowans Lab, Sandgem Professor Assistant House 1F, Sandgem Professor Assistant House 2F, Sandgem Southwest House, and Sandgem Pokémon Center B1F.
Version discipline
Rows merge only when Diamond and Pearl are identical, and each row carries D/P game markers. Version-exclusive species, mascot encounters, swarms, Radar slots, and GBA insertion slots keep their own labeled rows.
Route Plan
Cross Route 201; enter Rowan's Lab; accept the Pokedex; collect TM27 Return; visit home to tell Mom; deliver the Parcel later in Jubilife after buying Poke Balls and healing.
- Wild encounters begin before the player receives Poke Balls, so the first pass is for experience only.
- The opposite-gender assistant demonstrates catching on Route 202; their starter is the one neither the player nor Barry chose.
Exact pret map constants (10)
MAP_ROUTE_201 MAP_SANDGEM MAP_SANDGEM_POKEMART MAP_SANDGEM_POKECENTER MAP_SANDGEM_POKECENTER_2F MAP_SANDGEM_ROWANS_LAB MAP_SANDGEM_PROFESSOR_ASSISTANT_HOUSE_1F MAP_SANDGEM_PROFESSOR_ASSISTANT_HOUSE_2F MAP_SANDGEM_SOUTHWEST_HOUSE MAP_SANDGEM_POKECENTER_B1F
Wild Pokémon
Each area below has its own table, split by encounter method. Standard grass and cave rates merge every base slot for a species and are shown per time window: morning 04:00-09:59, day 10:00-19:59, night 20:00-03:59. Swarm, Poké Radar, and GBA dual-slot replacements keep their own labeled rows. Underlying slot odds: grass 20/20/10/10/10/10/5/5/4/4/1/1; Surf and Old Rod 60/30/5/4/1; Good and Super Rod 40/40/15/4/1.
| Pokémon | Games | Levels | Rate | Requirement / notes | ||
|---|---|---|---|---|---|---|
| Morning | Day | Night | ||||
| Grass / cave floor | ||||||
 Bidoof | DP | 2-3 | 50% | 50% | 60% | Rate counts base slots temporarily replaced by the daily swarm, hard-shaking Poké Radar patches, and GBA dual-slot insertions. |
 Starly | DP | 2-3 | 50% | 50% | 40% | Rate counts base slots temporarily replaced by the daily swarm, hard-shaking Poké Radar patches, and GBA dual-slot insertions. |
| Swarm (post-National Dex daily announcement) | ||||||
 Doduo | DP | 2 | 40% | Post-National Dex daily swarm; replaces grass slots 0-1. | ||
| Poké Radar (post-National Dex) | ||||||
 Nidoran F | DP | 3 | 20% | National Dex and Poké Radar required; replacement slot applies only in a hard/vigorous-shaking Radar patch. | ||
 Nidoran M | DP | 3 | 20% | National Dex and Poké Radar required; replacement slot applies only in a hard/vigorous-shaking Radar patch. | ||
| Nidoran F | DP | 2 | 2% | National Dex and Poké Radar required; replacement slot applies only in a hard/vigorous-shaking Radar patch. | ||
| Nidoran M | DP | 2 | 2% | National Dex and Poké Radar required; replacement slot applies only in a hard/vigorous-shaking Radar patch. | ||
| Dual-slot GBA insertion (post-National Dex) | ||||||
 Growlithe | DP | 2 | 8% | National Dex plus Pokémon FireRed inserted in the Nintendo DS GBA slot; replaces grass slots 8-9. | ||
| Starly | DP | 2 | 4% | National Dex plus Pokémon Ruby inserted in the Nintendo DS GBA slot; replaces grass slots 8-9. | ||
| Starly | DP | 2 | 4% | National Dex plus Pokémon Sapphire inserted in the Nintendo DS GBA slot; replaces grass slots 8-9. | ||
| Starly | DP | 2 | 4% | National Dex plus Pokémon Emerald inserted in the Nintendo DS GBA slot; replaces grass slots 8-9. | ||
| Starly | DP | 2 | 4% | National Dex plus Pokémon LeafGreen inserted in the Nintendo DS GBA slot; replaces grass slots 8-9. | ||
Trainers
Field order follows the map's object-event order. Full teams include explicit held items and moves when trdata defines them; cash rewards use the in-engine final-party-slot level and trainer-class multiplier formula.
No trainer object, scripted battle, or assigned boss team is sourced for this section.
Items
| Item | Version | Type | Area / exact direction | Coordinate / script | Requirement | Source |
|---|---|---|---|---|---|---|
| Potion | Diamond / Pearl | NPC / scripted gift | Route 201: Speak to the Pokemart employee waiting in the grass on Route 201. | NPC (140, 842); script 10 | First Route 201 crossing; one-time sample item. | script bank 392 |
| Poké Radar | Diamond / Pearl | NPC / scripted gift | Sandgem Rowans Lab: Receive it from Professor Rowan during the National Dex upgrade scene in his lab. | NPC (7, 5); script 3 | Enter the Hall of Fame, see the first 150 Sinnoh Pokedex species, and return to Rowan's lab for the National Dex event. | script bank 990 |
Hidden Items
No type-2 hidden-item event is present in the source maps assigned to this section.
Puzzles, Warps, And Switches
- Return to Twinleaf after the laboratory scene. Mom's conversation supplies the Journal and Barry's mother adds the Parcel objective.
Boss Strategy And Partners
No Gym Leader, rival branch, Galactic boss, Elite Four member, Champion, story partner, or major postgame battle is assigned here.
Completion Checklist
- Complete the currently reachable part of this route plan: Cross Route 201; enter Rowan's Lab; accept the Pokedex; collect TM27 Return; visit home to tell Mom; deliver the Parcel later in Jubilife after buying Poke Balls and healing.
- Review all 12 encounter rows across the per-area tables, including game markers, method band, time-of-day rates, levels, and each conditional requirement; mark conditional rows for their stated revisit.
- Defeat or deliberately skip every currently reachable trainer row; leave HM-, story-, or National-Dex-gated rows checked only after their access requirement is met.
- Collect currently reachable visible/scripted items and berry trees, use the Dowsing Machine for reachable hidden rows, and retain every explicitly gated row for the named cleanup visit.
- Resolve every currently available puzzle note, boss branch, and partner scene before opening the next section.
Sources And Validation
pret/pokediamondat commit038cccaed5de8f013875bc5d734f912d1de08e0f:map_header.c, D/P encounter archives,trdata.json, zone events, script archives, item tables, and trainer graphics.- Encounter slots were decoded from exact 424-byte D/P members and cross-checked against Gen IV slot behavior; the 0x6C pair is day, morning uses base slots, and 0x74 is night.
- Coordinates remain visible as QA anchors, while each hidden row also provides a plain-English map-region instruction.
- Generation-wide systems that are not tied to a normal map archive—Honey Trees, Great Marsh daily rolls, Trophy Garden, fossils, Pal Park, and event items—are explicitly curated in their dedicated system pages.
Dex quick links