There are several evolutionary items you’ll need to find to evolve your Pokémon. One of these items is Electrizer. You will find Electrizers attached to Elekid Pokemon that is available exclusively in the Pokemon Brilliant Diamond game. You will find Elekid 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 Protector or Elekid Pokemon.
Electirizer is used to evolve Electabuzz into Electivire when equipped and traded. Elekid has a five percent chance to carry an Electrizer and is exclusive to Brilliant Diamond.
How to reach the Grand Underground
Check this link on how to reach the Grand Underground
Where to Find Elekid Pokemon
Elekid is an Electric-type Pokemon available only in Brilliant Diamond. There is a total of 18 hideaways/Biomes in the Grand Underground. You will find Elekid in Dazzling Cave, Whiteout Cave, Stargleam Cavern, & Glacial 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 Electric Type Statues in your secret base to increase the chances of Elekid spawning.
Dazzling Cave, Whiteout Cave, Stargleam Cavern, & Glacial Cavern (from left to right)
Biomes mentioned above are highlighted below