There are several evolutionary items you’ll need to find to evolve your Pokémon. One of these items is Magmarizer. You will find Magmarizer attached to Magby Pokemon which is available exclusively to the Pokemon Shining Pearl game. You will find Magby in the Grand Underground of Pokemon Brilliant Diamond & Shining Pearl (BDSP). This guide shows how to reach the grand underground and the underground hideaway/ Biome, and where you will find Magmarizer or Magby Pokemon.
Magmarizer is used to evolve Magmar into Magmortar when equipped and traded. Magby has a five percent chance to carry a Magmarizer and is exclusive to Shining Pearl. Unfortunately for those who own Pokemon Brilliant Diamond need to trade only.
Magby is a Fire-type Pokemon available only in Shining Pearl exclusive edition. Magby is also locked to the post-game as you have to go in Sinnoh Underground which is a battle area. You will find Magby in the Grand Underground of Pokemon Brilliant Diamond & Shining Pearl (BDSP).
How to reach the Grand Underground
To reach the Grand Underground, you will first need the Explorer Kit. You will get the Explorer Kit in the Underground Man’s House, which is right next to Pokémon Center in Eterna City as shown in the picture below. Enter the house and talk to the Underground Man to receive the Explorer Kit. The Explorer Kit will be in your Bag’s Key Items pocket.
Once you have the Explorer Kit, go to your Bag’s Key Items pocket and use the Explorer Kit to enter the Grand Underground. Then you can explore the Grand underground.
Where to Find Magby
There is a total of 18 hideaways/Biomes in the Grand Underground. Magby is also locked to the post-game as you have to go in Sinnoh Underground which is a battle area. You will find Magby in Volcanic Cave, Sandsear Cave, Typhlo Cavern. These caverns can be identified on the minimap by their icon shown in the picture below. You will need to press ‘Y’ to open the minimap. Click here to see how to reach all the areas in the grand underground. Place Fire Type Statues in your secret base to increase the chances of Magby spawning.
Volcanic Cave, Sandsear Cave, Typhlo Cavern (from left to right)
Biomes mentioned above are highlighted below
Not post-game locked.