Rotom is certainly an unusual Pokémon. Rumored to be a “Pokémon that merged with a toy robot,” according to Professor Rowan, Rotom has a rather unique ability: It can change forms after interacting with everyday household appliances. Here’s how to change Rotom’s form in Pokémon Brilliant Diamond and Shining Pearl.
First, you’ll have to get Rotom from the Old Chateau, which requires that you beat the game and obtain the National Pokédex beforehand. Catching Rotom will also get you the Secret Key,
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