Before the eruption that destroyed Guren Town in Kanto, the Pokémon that inhabited the mansion fled to different areas. As a result, Windie live amongst the islands surrounding Guren Town. You’ll find wild ones that evolved during the long trek.
(P.S. New Pokémon drawings every single day. Commissions and prints of this and all other drawings available! Contact firstname.lastname@example.org for more information)