Is the Stench flinch chance added onto a move flinch chance?

Question

Such as a Skuntank using Astonish. Will the 10% Stench flinch chance add onto the flinch chance of Astonish. I know that Razor Fang and King's Rock don't stack with Stench.

Answer 1

Stench does not stack with any moves that have an existing chance to flinch.

Stench (Bulbapedia)

Answer 2

I've looked and looked and looked, and, as I expected, nobody was actually clever enough to ask or test this out. Everybody seems to be saying that it "adds Flinch chance", not "raises Flinch Chance", so based on that, here's a possible theory:

It's kinda like stacking Infatuation with Paralysis. Both have a 50% chance of making the infected Pokemon not attack, but they're not stacked for 100% immobility. You'll have a 50% chance of breaking through Infatuation. If you break through it, you have to chance another 50/50 shot at resisting paralysis.

Stench is the same way. Used with Astonish, you have to calculate two separate Flinch chances: One for calculating Stench's Flinch chance, and another for Astonish's. So in the end, you won't have a 20% flinch rate, but rather, two 10% Flinch Rates; not exactly the favorable outcome....

This is purely a guessing game based on what people have said about the ability itself, though. Wait for other answers, and I'll keep looking. If I find confirmation on what's really happening, I'll edit my answer.

Comments

There is a way of adding them with both paralyze and Infatuation it is 75%

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Good answer, I wish I could give you best answer, but you know the reason why I can't. Just have to do with an up vote.

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I think to work it out you multiply the probabilities that it won't happen for each. The Paralysis/Infatuation thing works out at 0.5 x 0.5 = 0.25 = 25% chance of being able to attack. For Stench/flinch move it's 0.9 x 0.9 = 0.81 = 81% chance to attack.