Find A Mino is a Coromon Quest you can find in Hayville.
Speak to Chuck outside of Hayville entrance. You'll come across Hayville during Part 2 of our Coromon Walkthrough.
He will ask if you would like to trade a Mino for a Beezel Coromon.
You can find a Mino in Radiant Park. They have Uncommon rarity, so they don't spawn too often but they shouldn't take longer than 10 minutes to capture.
Once you trade Mino for a Beezel, Chuck will run off.
Trainer Battle with Chuck
You can now track him down at the bridge in Radiant Park for a Trainer Battle, where he will use the Mino you traded against you.
You'll get 58 Gold for beating him.