There are several Pokémon that you may have a hard time finding in Pokémon Brilliant Diamond and Brilliant Pearl. This is because they are hidden throughout the game. You will need to find this Pokémon in a specific area for those looking for Magby, after a particular time in the game. In this guide, we are going to detail where you need to go to find and catch Magby in Brilliant Diamond and Shining Pearl.
You won't be able to find Magby on any of the trails or in the wild. Instead, you can only find this Pokémon while wandering the Grand Underground. You will unlock this area after obtaining the Explorer Kit from the old man of Eevopolis, where you can fight the second Gym Leader.
It is important to note that Magby is a Pokémon exclusive to Pokémon Shining Pearl. You will not be able to find Magby in Pokémon Brilliant Diamond. If you own the Brilliant Diamond version, you can only get this Pokémon by trading it with a friend who owns Shining Pearl.
While searching for Magby, you can find this Pokémon after defeating the third Gym Leader, Maylene, but you can also find it before battling the fourth Gym Leader, Wake. As long as you pass the third Gym Leader, you can search for Magby in the Grand Underground. It is advisable to search for it in environments with warmer climates. There is also the possibility that Magby has a Magmarizer on it when you take it, allowing you to evolve its next form, Magmar, into Magmortar.