Official's Post
As if a divine answer from the heavenly beasts, you see an item lying on the ground! Looks like a Poke Ball! This will definitely help you catch that Blitzle after wasting so many Great Balls.
Volcano rushes ahead of you to pick the item up, like any faithful partner would.
But wait...what's wrong with Volcano?! He stops dead in front of the Poke Ball...and falls down, unconscious!
Volcano has been injured! Volcano cannot be used in any wild Pokemon battle or League battle until you return to a city!
What could've caused this? You see the Poke Ball move...that's no item!
A wild Foongus appeared!
Startled, but ready to defend itself.