Needs Triage Bug Report - Mechanics

What type of bug are you reporting? Mechanics

What is the bug?
Last week, my friend Etchy posted a video on his Twitter showing that in Gen 4, U-Turning into a Pokemon holding a King's Rock can cause the opposing Pokemon to flinch, even if the Pokemon using U-Turn does not have any flinching item. As far as I can tell, this interaction only occurs with King's Rock/Razor Fang, and no other items or abilities can cause this particular effect. This interaction is not present at all on PS!.

Doing some tests, I found that the opposing Pokemon will not flinch if the Pokemon using U-Turn holds a King's Rock and the Pokemon switched in does not have the item or has the ability Klutz. The move can still flinch if the Pokemon using U-Turn has Klutz, as long as the Pokemon switched in does not.

Are you able to replicate it? If so, how?
Etchy's cartridge footage
My footage
Klutz footage
 
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