Flinching on Rocky Terrain with Low Health

[BandorKitty 390]

I had a quick look and I couldn't find this anywhere, sorry if I didn't look hard enough. I'm grinding on Route 2 and this has happened multiple times. To get it to happen for sure, get the wild Pokemon's health down to the red zone, then switch Pokemon to one that knows Fake Out. If the Fake Out is not enough to knock out the wild Pokemon but the Pokemon is instead knocked out by the "flinching on rocky terrain" damage that follows, instead of fainting the Pokemon sprite will move down the screen like normal but not disappear. It can still be seen behind the player Pokemon's health bar. It will then use one move before the battle ends. I managed to get a screenshot.