Wondering if a Pokemon with skill link using a multi-hit move with kings rock will boost the flinch chance. For Instance, I want to know whether or not Cinccino's Tail Slap, With Skill Link and King's Rock, will boost its Flinch Chance to 50% or will it keep to 10%?
Yes, it will boost the flinch chance. Every hit in the multi-hit move gets the same chance to flinch, and it eventually stacks.
Source: Serebii's "POTW" for Cinccino