AI Overview
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In the Pokémon games, Azurill can sometimes change gender when it evolves into Marill. Specifically, before Generation VI, a female Azurill had a 1/3 chance of evolving into a male Marill. This is because Azurill has a gender ratio of 75% female and 25% male, while Marill has a 50/50 ratio. This gender change was likely a programming error or glitch, and it was fixed in Generation VI (Pokémon X and Y) and later games, where female Azurill now always evolve into female Marill.
Here's a more detailed explanation:
Gender Ratios:
Azurill has a 75% female, 25% male gender ratio.
Evolution:
When Azurill evolves into Marill, the gender ratio changes to 50% female, 50% male.
The Glitch:
Due to the different gender ratios, some female Azurill would end up evolving into male Marill.
Generation VI Fix:
This gender change behavior was removed in Generation VI, so Azurill now retains its gender upon evolving.