Pokemon Diamond and Pearl Phase 10: Post-Game Battle Zone and National Dex Walkthrough

Complete Sinnoh's seen Pokedex, unlock the National Dex and Battle Zone, master special encounter systems, and catch the non-event postgame legendaries. Open every section below for its exact map-level data and route checklist.

Phase Snapshot

Section Pages

Major Battles And Partners

Phase Checklist

1. National Dex, Swarms, Poke Radar, and Dual-Slot Encounters — Audit the Sinnoh seen Pokedex; fill missing trainer-seen species; visit Rowan's Sandgem lab; receive the National Dex from Oak; collect the Poke Radar; speak to the assistant's sister once to enable swarms and revisit her to identify the current route; check Trophy Garden and Great Marsh rotations; insert a compatible GBA game before boot for dual-slot encounters; use Radar only in large grass patches.
2. Routes 219-221 and Pal Park — Start south of Sandgem; clear Route 219 swimmers; sweep Route 220's branching sea lanes; land on Route 221; battle every trainer; visit the level-item house with matching-level leads; enter Pal Park; migrate a planned set of six from a compatible GBA cartridge; complete the Catching Show.
3. Fight Area and Postgame Barry Rematches — Sail from Snowpoint; tour Fight Area and collect gifts; meet Barry and Buck; open the Battle Park gate; return on Saturday or Sunday after Stark Mountain for Barry's rematch; clear the Elite Four repeatedly if pursuing his highest-level team.
4. Battle Park, Battle Tower, and Palmer — Collect the Point Card; inspect the exchange counter; build a legal three-Pokemon Singles team; begin a seven-battle set; challenge Palmer on the 21st Singles win; continue toward the second Palmer battle at win 49; spend BP only after checking the full prize list.
5. Routes 225-226 and Survival Area — Leave Fight Area west; clear Route 225's cliffs and Cut branches; visit the route house; heal in Survival Area; tour every house; continue east to Route 226; Rock Climb both cliff faces; Surf around the central rocks; complete the local trade; collect hidden shoreline items.
6. Route 227 and Stark Mountain Approach — Leave Route 226 north; clear every ash-grass trainer; visit the rest house; use the Bicycle across narrow rails; climb with Rock Climb; collect items around crater ledges; meet Buck; enter Stark Mountain fully stocked.
7. Stark Mountain, Buck, and Heatran — Clear the solo entrance rooms; meet Buck; use his healing through the paired interior; defeat every trainer duo; solve Strength and Rock Smash routes; reach the rear chamber; watch Buck take the Magma Stone; return to Survival Area; speak to Buck in the house; revisit the same chamber; save and catch Heatran.
8. Routes 228-230 and Resort Area — Travel east from Route 226 or south from Route 227; clear Route 228's upper and lower lanes; visit both houses and the Route 226 gatehouse; use Bicycle mud ramps; enter Route 229; sweep both grass lanes; tour Resort Area; check Ribbon Syndicate eligibility; Surf through Route 230's islands; return to Fight Area.
9. Route 224 and Marley — Return to Victory Road after the National Dex; enter the east rear room; meet Marley; use her Arcanine and free healing to clear every trainer and item; escort her to the Route 224 exit; sweep Route 224's land and water branches; inspect the polished white rock; reserve its event extension for Oak's Letter.
10. Fullmoon Island and Cresselia — 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.
11. Spring Path, Sendoff Spring, and Turnback Cave — Find the newly opened Spring Path on Route 214; use Rock Climb to descend around Sendoff Spring; enter Turnback Cave; use Defog; choose doors while counting rooms; find the first, second, and third pillar before thirty rooms; enter Giratina's chamber; save and catch it; collect the post-capture item according to route efficiency.
12. Old Chateau and Rotom — Enter Eterna Forest from the south; use Cut at the Old Chateau fence; clear 1F and all 2F side rooms; collect the Old Gateau and hidden items; return between 8:00 p.m. and 3:59 a.m.; save in the television room; interact with the TV; catch Rotom.
13. Snowpoint Temple and Regigigas — Obtain the National Dex; return to Snowpoint and gain temple permission; bring Strength, Rock Smash, and a controlled capture team; descend every floor for items; solve B5F's ice slide; place Regirock, Regice, and Registeel in the active party; save before the statue; interact and catch Regigigas.

Data Coverage

This phase owns 141 Diamond/Pearl source maps and publishes 757 encounter rows, 95 trainer rows, 262 visible/scripted items, and 50 hidden-item rows. Counts include explicit starter/rival branches and curated systems but never substitute Platinum encounters or story maps.