This chapter of the guide to Dragon Ball Z: Kakarot has a walkthrough for Cute and Cuddly Korin side quest.
Time frame: From Majin Buu Reborn - Episode 8: Finale to No time limit
Reward: 238,977 EXP, D Medal, Master Korin Plush
Where to start: Southeast Islands Area, as Goku.
To start this mission, you need to go to Kame House. Talk to Korin to get a new substory.
Your task is to find Meowmint. Go to the location specified on the map, and then go to the mountain shown in the screenshot above. The item is next to it.
Go back to the quest giver to complete the mission.