This is tagged transgender and ftm due to a glitch in pokemon Ruby/Saphire/Emerald that causes female Azurill to change gender 25% of the time during evolution. >Prior to Generation VI, because Azurill's gender ratio does not match that of its evolved forms and its Evolution is not dependent on gender, being female 75% of the time while Marill and Azumarill are female only 50% of the time, one out of three female Azurill evolves into a male Marill (depending on the last byte of its personality value). Azurill is the only Pokémon to do this. From Generation VI on, Azurill retains its gender upon evolving, despite the gender ratios still differing. (Source: Bulbapedia)