Phase 10 section
Pokemon Diamond and Pearl Fullmoon Island and Cresselia Walkthrough
Help Sailor Eldritch's son, sail to Fullmoon Island, release Cresselia, retrieve the Lunar Wing, and track the roaming legendary. Exact Diamond/Pearl encounters, every sourced trainer, visible and hidden items, puzzle notes, boss teams, and completion checks.
Help Sailor Eldritch's son, sail to Fullmoon Island, release Cresselia, retrieve the Lunar Wing, and track the roaming legendary. 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
Fullmoon Island Exterior and Fullmoon Island Interior.
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
Visit the sailor's house in Canalave after the National Dex; speak to the sleeping child and mother; ask Eldritch to sail to Fullmoon Island; enter the grove; save if desired; interact with Cresselia; collect the Lunar Wing it leaves; return to the child; use Marking Map and a route-boundary loop to catch Cresselia.
- Cresselia begins roaming immediately and retains damage and status between encounters, like Mesprit.
- The Lunar Wing remains on Fullmoon Island after Cresselia flees; collect it before sailing back to wake the sailor's son.
Exact pret map constants (2)
MAP_FULLMOON_ISLAND_EXTERIOR MAP_FULLMOON_ISLAND_INTERIOR
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 | ||||
| Roaming encounter | ||||||
 Cresselia | DP | 50 | One roaming individual | National Dex; interact on Fullmoon Island during Sailor Eldritch's nightmare quest Flees from the island and then from wild meetings; retains HP and status and can be tracked with Marking Map. | ||
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 |
|---|---|---|---|---|---|---|
| Lunar Wing | Diamond / Pearl | Visible item ball | Fullmoon Island Interior: Pick up the item ball in the northwestern part of Fullmoon Island Interior, 6 tiles north of the Fullmoon Island Exterior doorway or transition. | (16, 15) | National Dex and the Sailor Eldritch family event are required before the Fullmoon Island trip. | event bank 253, script 7252 |
| Lunar Wing | Diamond / Pearl | Story field pickup | Fullmoon Island and Cresselia: Left in Fullmoon Island's grove when Cresselia begins roaming; return it to the sleeping child in Canalave. | NPC / system | See the route plan. | editorial script/system note |
Hidden Items
No type-2 hidden-item event is present in the source maps assigned to this section.
Puzzles, Warps, And Switches
- Fullmoon Island itself is a short linear path. The real capture puzzle is route tracking: cross adjacent route boundaries until Cresselia shares the current route, then enter grass without Flying.
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: Visit the sailor's house in Canalave after the National Dex; speak to the sleeping child and mother; ask Eldritch to sail to Fullmoon Island; enter the grove; save if desired; interact with Cresselia; collect the Lunar Wing it leaves; return to the child; use Marking Map and a route-boundary loop to catch Cresselia.
- Review all 1 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
