The Explorer Kit is an essential tool you will need in Pokémon Brilliant Diamond and Brilliant Pearl. With it, you'll be able to explore the Grand Underground, where you can locate dozens of Pokémon that you usually wouldn't be able to find in your game. Additionally, you can expect to discover several Pokémon that generally wouldn't appear in other places. Here's what you need to know about getting your Explorer's Kit in your game.
You can find the Explorer Kit in both games in the exact location. You will first need to reach Eevopolis. You can do this after defeating the first Gym Leader, Roark, in Ore City. After doing this, you will be able to progress further in the game. When you reach Eevopolis, all you have to do is find the location of the Pokémon Center and visit the house to its right. Instead, you can talk to an old man who can offer it to you.
Once you have the Explorer Kit, you can visit the Grand Underground. You can find the Explorer Kit in your bag under the Key Items tab. The huge area offers many Pokémon to catch. Each region of this area has a mirrored area in the position above. So, if you want to visit a specific part of the Grand Underground, we recommend using the Explorer Kit in the location above it. When you use it