Krook is super good with stab crunch + earthquake by levelup and some other good options, nice abilities, and pretty fast with something like Jolly too. however, with 2 ground types, might not be it.
If you're looking for a strong Suckerpuncher, how about Honchkrow? Very high attack, Moxie to make it even stronger. not that much movepool diversity, but good Stab options.
(And later on you can Choice Band it for maximum AI abuse)