When you use an antidote on a poisoned Pokemon when you're right outside a Pokemon Center.
That's not bad, if you're trying to build friendship it (was) necessary in the past games. You don't want to let it faint, if it happens to be on the last health before you get to the counter and it faints, then tough luck getting your crobat
Everyday the sun comes up around her, she can make the birds, sing harmony! http://i.imgur.com/VBsWOu2.png <3 Ain't no woman like the one i got..