Phase 3 section
Pokemon Diamond and Pearl Veilstone Gym and Maylene Walkthrough
Cobble Badge Slide the Gym's wall panels to open three lanes, defeat every Black Belt, and beat Maylene's Lucario for the Cobble Badge. Exact Diamond/Pearl encounters, every sourced trainer, visible and hidden items, puzzle notes, boss teams, and completion checks.
Phase 3 Cobble Badge Galactic Eterna Building, Cycling Road, Hearthome, Solaceon, Veilstone City, and Maylene. 03 / 11 
Slide the Gym's wall panels to open three lanes, defeat every Black Belt, and beat Maylene's Lucario for the Cobble Badge. 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
Veilstone Gym.
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
Bring Flying- and Psychic-type damage; push wall panels from both sides to align door gaps; clear the left, right, and center trainers; heal; save before Maylene; answer Lucario with Ground, Fire, or Fighting damage if Flying/Psychic coverage is unsafe.
- Maylene's Meditite and Machoke set up the stronger Lucario finish; avoid spending the Lucario answer too early.
- The Cobble Badge permits Fly outside battle, but HM02 is collected from the Galactic warehouse immediately after the Gym.
Exact pret map constants (1)
MAP_VEILSTONE_GYM
Wild Pokémon
No random wild encounter archive or curated static/gift row applies to this section. This is expected for some buildings, story rooms, and Gym interiors.
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.
| Trainer | Route order / placement | Full team | Reward | Access requirement | Optional / rematch note |
|---|---|---|---|---|---|
 Black Belt ColbyBlack Belt • source ID 309 | Veilstone Gym • field order 1 at (12, 13) | ₽600 | Reach the trainer's named field subarea; line of sight determines whether the battle is avoidable. | Field order 1, tile (12, 13); sightline/path determines whether it can be avoided. No higher-level same-trainer rematch variant is defined in trdata. | |
| Black Belt DarrenBlack Belt • source ID 310 | Veilstone Gym • field order 2 at (5, 19) | ₽600 | Reach the trainer's named field subarea; line of sight determines whether the battle is avoidable. | Field order 2, tile (5, 19); sightline/path determines whether it can be avoided. No higher-level same-trainer rematch variant is defined in trdata. | |
| Black Belt JefferyBlack Belt • source ID 312 | Veilstone Gym • field order 3 at (12, 19) | ₽624 | Reach the trainer's named field subarea; line of sight determines whether the battle is avoidable. | Field order 3, tile (12, 19); sightline/path determines whether it can be avoided. No higher-level same-trainer rematch variant is defined in trdata. | |
| Black Belt RafaelBlack Belt • source ID 311 | Veilstone Gym • field order 4 at (19, 18) |
| ₽672 | Reach the trainer's named field subarea; line of sight determines whether the battle is avoidable. | Field order 4, tile (19, 18); sightline/path determines whether it can be avoided. No higher-level same-trainer rematch variant is defined in trdata. |
 Leader MayleneLeader Maylene • source ID 317 | Veilstone Gym • scripted | ₽3,600 | Scripted story trigger; complete the local objective described in the route plan. | Major or story battle; not a VS Seeker rematch row. |
Items
| Item | Version | Type | Area / exact direction | Coordinate / script | Requirement | Source |
|---|---|---|---|---|---|---|
| TM60 | Diamond / Pearl | NPC / scripted gift | Veilstone Gym: Receive this TM from the Gym Leader immediately after the badge victory. | NPC (12, 4); script 2 | Defeat the Gym Leader; this is part of the one-time badge reward. | script bank 132 |
Hidden Items
No type-2 hidden-item event is present in the source maps assigned to this section.
Puzzles, Warps, And Switches
- Push each horizontal panel until its opening aligns with the vertical aisle. Some panels must be approached from behind through an adjacent lane, so clear outer lanes before the center.
Boss Strategy And Partners
Leader MayleneLeader Maylene • source ID 317Full team
MedititeDrain Punch / Confusion / Meditate / Detect
MachokeBrick Break / Rock Tomb / Leer / Foresight
Lucarioholds Sitrus Berry • Drain Punch / Force Palm / Metal Claw / Bone Rush
Danger notes
Lucario is not weak to Flying or Psychic because Steel changes the matchup, and Drain Punch can recover health.
Practical counters
Use Fire, Fighting, or Ground for Lucario; Flying or Psychic remains excellent into Meditite and Machoke.
Completion Checklist
- Complete the currently reachable part of this route plan: Bring Flying- and Psychic-type damage; push wall panels from both sides to align door gaps; clear the left, right, and center trainers; heal; save before Maylene; answer Lucario with Ground, Fire, or Fighting damage if Flying/Psychic coverage is unsafe.
- Review all 0 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