There are 6 Cat Locations in South Park The Fractured But Whole, needed for the Scavenger Hunt: Big Gay Als Big Gay Cats.

To do this you will need to have learned the fart that stops time. Use this fart and run up to the cats to grab them quickly before time continues. There are a few cats on trees. Knock them down the tree using firecrackers and then use the time-stopping fart to grab them as they hit the ground.

Your reward is the feline costume. It's given to you by Big Gay Al after returning his six cats to him.