I was battling Groudon in Emerald, tossing Ultra Balls when I could, up to the point where it started using Struggle, which indicates that the opposing Pokemon has run out of PP for their moves. As it was already in the red zone to begin with when Groudon ran out of PP, I threw an Ultra Ball. It clicked closed on the first try. It is probably coincidence that this happened, but I wanted to confirm it here first.
So the question is?
Did Groudon running out of PP affect its Capture Rate?