The Pokémon mass outbreak/swarm mechanic was first introduced in Pokémon’s second Generation and went on to appear in every Pokémon game up until Black 2 and White 2. Starting with Pokémon X and Y, the feature was abandoned, but since Pokémon Brilliant Diamond and Shining Pearl are remakes of the Generation IV games of the same names, the swarm mechanic is back once more. Here’s how to unlock this mechanic in Brilliant Diamond and Shining Pearl, as well as how it works.
First, you have to defeat
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