What are some good krokorok partners?
Defensively, Krok can't handle grass, ice, or water types. Also, he can't deal with Mr. Mime and freezie Rotom.
Grumpig deals with freezie Rotom and other ice types well on account of Thick Fat and Focus Blast, and it appreciates Krok's pressure on other psychic types.
Zebstrika is a good offensive partner to deal with grass and water types. It can pressure them out and keep momentum going with Volt Turn. It's standard, but make sure you run Overheat so you're able to KO common grass types like Roselia when your opponent isn't able to switch them out.
Gourgeist(?) seems like a good defensive partner to get rid of grass and water types, because it can block the grass status moves and has enough bulk to tank out water types, but it's weak to Ice Beam, so I'm not sure how well it would hold up, given the current abundance of ice moves on water types.
Pelipper is a more reliable defensive partner for Krok. It tanks grass, water, and ice moves all well, and can act as a pivot. Pelipper can also pair very well with Krok to push out Monferno and Leafeon because of the high bulk, synergy with Krok, and Krok's intimidate.
Hoped this helped a bit :)