Evolving Hisuian Qwilfish allows you to add Overqwil to your Pokédex in Pokémon Go.
Both these Pokémon share the same typing - Dark and Poison - and debuted during the Hisuian Discoveries event in July 2022.
This page explains how to evolve Hisuian Qwilfish and get Overqwil to add them to your collection.
How to evolve Hisuian Qwilfish and get Qwilfish in Pokémon Go
If you want to evolve an Hisuian Qwilfish into Qwilfish in Pokémon Go, you'll need to gather 50 Qwilfish Candy, then win 10 Raids while they are your Buddy Pokémon.
Hisuian Qwilfish debuted during the Hisuian Discoveries event, where it could be found in the wild and by hatching 7km eggs for the duration.
Next, let's discuss the Candy evolution requirement. Candy is primarily earned from catching Qwilfish or Hisuian Qwilfish - they share the same Candy pools - with the chance to get more by using Pinap Berries and / or having a Mega Evolution active that shares the same Dark and Poison typing (such as Mega Houndoom, Mega Gyarados, Mega Absol, Mega Venusaur, Mega Beedrill or Mega Gengar) while catching.
The second requirement to have the Hisuian Qwilfish as your Buddy then win a total of 10 raids. They don't have to participate in those raids - just need to be your Buddy for the duration.
This can be a grind, but there are some events which allow you to speed through a number of raids in quick succession. If you are playing during the July 2022 Hisuian Discoveries event, there is a Hisuian Braviary Raid Day on Sunday, 31st July (with five free Raid Passes on offer by spinning Gym Photo Discs) and beyond that, participating in a Raid Hour that takes place every Wednesday between 6pm to 7pm local time.
The Season of Timeless Travels has arrived in Pokémon Go! The Along the Routes event is here, bringing Gift Exchange and the A Route to New Friendships quest with it. During it, take the time to try out Routes and Party Play while you're hunting down rare Pokémon, fighting in the Go Battle League or competing in PokéStop Showcases.
If you prefer to take your time with this requirement, then remember that you only need Hisuian Qwilfish as your Buddy during the raid - meaning if you prefer to swap it out for another Buddy you are levelling up in the hours, days or weeks between, then you can.
Then, once you have completed 10 raids and have 50 Qwilfish Candy, you can evolve away. Enjoy your new Overqwil!