Unfortunately Surskit can't have Defog as an Egg move same as the Powder move..I think I heard somewhere that ducklett and surskit are in the same egg group. it might have someone tooting a non existent horn though.
EDIT: Just checked and yes, Surskit and Ducklett are in Water 1. So it may actually be possible if you breed a surskit with Defog from Ducklett who gets it from level up.