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Why is my raichu wearing a white santa hat
But when it was pikachu, the hat was red.
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Niantic has been messing around with the code for giving Pokemon gender, and have been using Pikachu/Raichu as their test cases. Shortly after the update the other day, people noticed that some of their Pikachu/Raichu had different tails indicating they were female (so far everything has been male by default). At some point today, they all reverted back to being male, but the Raichu hat was the wrong color.