Poke Project

LOADING

Loading

Setting the field…

Please wait

Poke ProjectGen 1–9

Main

Home
Damage Calc
Memos
Team Memos
Tier Maker
Board
Silhouette Quiz

Dex

Pokémon Dex
Item Dex
Ability Dex
Move Dex

More Dex

Generation Dex
Type Chart
Nature Dex
Egg Group Dex
Color Dex
Shape Dex
Habitat Dex
Growth Rate Dex
Berry Dex
Machine Dex
Location Dex
Contest Dex

Support

Guides
Contact

Account

Settings

All-in-one Pokémon support & info tools

Language

Item Dex / Emerald / Basement Key

Basement Key

Gen 3 · EmeraldPlot advancement

The key to NEW MAUVILLE, which was constructed beneath MAUVILLE CITY.

Back to list Item categories

Basement Key · Emerald · Poke Project

Use in calculator

Gen 3: Ruby / Sapphire
Gen 3: Emerald
Gen 3: FireRed / LeafGreen
Gen 3: Colosseum
Gen 3: XD
Gen 4: Diamond / Pearl
Gen 4: Platinum
Gen 4: HeartGold / SoulSilver
Gen 5: Black / White
Gen 5: Black 2 / White 2
Gen 6: X / Y
Gen 6: Omega Ruby / Alpha Sapphire
Gen 7: Sun / Moon
Gen 7: Ultra Sun / Ultra Moon
Gen 7: Let's Go, Pikachu! / Let's Go, Eevee!
Gen 8: Sword / Shield
Gen 8: The Isle of Armor
Gen 8: The Crown Tundra
Gen 8: Brilliant Diamond / Shining Pearl
Gen 8: Legends: Arceus
Gen 9: Scarlet / Violet
Gen 9: The Teal Mask
Gen 9: The Indigo Disk

Category: Plot advancement
Cost: 0

Pokémon that hold this item

0 entries

No data found.

All-in-one Pokémon support & info tools

Main

Damage Calc
Memos
Team Memos
Tier Maker
Board

Dex

Pokémon Dex
Item Dex
Ability Dex
Move Dex
Generation Dex
Type Chart
Nature Dex
Egg Group Dex
Color Dex
Shape Dex
Habitat Dex
Growth Rate Dex
Berry Dex
Machine Dex
Location Dex
Contest Dex

Support

Guides
Contact

© 2026 Poke Project

·

Pokémon is © Nintendo, Creatures, GAME FREAK.

About Terms of use Privacy policy