Single post in All About Deltas

Breed scorbunny with an ice type parent: put a scorbunny (or evo) in the daycare with a compatible ice type pokemon, preferably single typed, and the resulting eggs will be more likely to be ice type. Scorbunny's in the Field and Human-like egg groups, so if you look at the "Ice" entries in those tables on the first post, you can see the compatible pokemon with the highest chance of producing ice-type eggs (in this case, the ones in the Field egg group table, since they're single type).