Both sides aren't incorrect, it's just how you view things. Personally, I view it BAD's way: You start the game on frame 1 and picking up the Pokemon advances it by 0. However, you guys view it as starting the game on frame 0 and picking up the Pokemon advances it by 1.
It really doesn't matter. You advance the frame the same number of times anyway. It's just a matter of perspective. Some people view it one way because it's easier for them.
It really doesn't matter. You advance the frame the same number of times anyway. It's just a matter of perspective. Some people view it one way because it's easier for them.