Heyo, found a bug while having this battle here:
http://replay.pokemonshowdown.com/uususpecttest-234790228
On turn 21, the Wobbufett gets off a first move Destiny Bond due to the effect of its Custap berry, and did not faint during that same turn. This should mean the effect of Destiny Bond is no longer active at the start of turn 22.
However, upon being fainted the next turn, Destiny Bond still takes effect.
I figured this had to be a bug, as I've run into Quick Claw Wobbufett before, (granted, never Custap berry using ones), and safely fainted them the following turn.
I would think it's logical to assume that both Custap berry and Quick Claw are treated as a similar event when it comes to Destiny Bond's mechanic, right?
I've also double checked this on Bulbapedia:
http://bulbapedia.bulbagarden.net/wiki/Destiny_Bond_(move)
"if the user is faster than the opponent (or otherwise moves first), Destiny Bond only lasts for the current turn; conversely, if the user moves last, it takes effect during the next turn."
The "(or otherwise moves first)" is the berry/Quick Claw/Prankster Priority, no?
Also, just to verify more, it says "if the user moves last, it takes effect during the next turn." It moved first regardless. Therefore Destiny Bond shouldn't be activated.
Alright, thanks! :)