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Ash caught Unfazant when she was a Pidove, not far from Professor Juniper's lab. Her gender was revealed during the battle with Ash's future Snivy, as she was immune to Snivy's attract attack.
Pidove evolved into Tranquil during the attempt to clear a swarm of Venipede out of Castellia City.
During the gym battle against Skyla, Tranquil evolved into Unfezant, defeating the gym leader's Swanna.