So, I'd really want to understand how swarms work exactly, I think they are a cool mechanic, but it's hard to keep track of which pokémon can spawn at swarms and where, since I can't look it up with the pokédex. Is there anywhere I can see the swarm locations? And also, how long do they last? Can they spawn in multiple regions or only one at a time? I'd be very grateful if someone could answer me this <3 e_e ( english not first language )