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To get these pokemon, you have to have National Pokedex and then insert a GBA version into the GBA slot on your Nintendo DS.

Diamond/Pearl Dual Slot Locations

Ruby

Seedot - Eterna Forest, Route 203, Route 204, Route 210

Nuzleaf - Route 210 (east), Route 229

Mawile - Iron Island (does NOT appear on 1st Floor)

Solrock - Lake Acuity, Lake Valor, Lake Verity, Mt. Coronet, Sendoff Spring, Turnback Cave

Haunter - Old Chateau

Gengar - Old Chateau (on 2nd Floor, second room from the right ONLY)

Zangoose - Route 208, Route 210

Sapphire

Sableye - Iron Island (does NOT appear on 1st Floor)

Lunatone - Lake Acuity, Lake Valor, Lake Verity, Mt. Coronet, Sendoff Spring, Turnback Cave

Haunter - Old Chateau

Gengar - Old Chateau (on 2nd Floor, second room from the right ONLY)

Seviper - Route 208, Route 210

Lotad - Route 203, Route 204, Route 205 (Eterna City side), Route 212 (east)

Lombre - Route 212 (east), Route 229

Emerald

Teddiursa - Acuity Lakefront, Route 211

Ursaring - Lake Acuity, Route 216, Route 217

Pineco - Eterna Forest, Route 203, Route 204, Route 210 (east), Route 229

Gligar - Route 206, Route 207, Route 214, Route 215, Route 227, Stark Mountain (outside)

Haunter - Old Chateau

Gengar - Old Chateau (on 2nd Floor, second room from the right ONLY)

Fire Red

Metapod - Eterna Forest

Caterpie - Route 204 (south)

Ekans - Route 212 (east)

Arbok - Great Marsh

Growlithe - Route 201, Route 202

Elekid - Route 212 (east), Valley Windworks

Haunter - Old Chateau

Gengar - Old Chateau (on 2nd Floor, second room from the right ONLY)

Leaf Green

Kakuna - Eterna Forest

Weedle - Route 204 (south)

Vulpix - Route 209, Route 214

Sandshrew - Route 228, Wayward Cave

Haunter - Old Chateau

Gengar - Old Chateau (on 2nd Floor, second room from the right ONLY)

Magby - Route 227, Stark Mountain (inside & outside)