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What are Swarms?

Swarms are a limited period of time where a Pokemon can be caught outside of it's usual encounter spot and/or at a higher encounter rate. You will be able to catch some of the harder to obtain Pokemon a little more easily if a swarm of them appears. Swarms were recently reworked in the 2015 update so current durations of swarms and what Pokemon appear in swarms are currently unknown. If you find a swarm please post in this thread with screenshot proof.

How to tell if there is a Swarm?

Swarms are announced on the televisions in NPC houses.

Can you catch a shiny in a Swarm?

Yes this is entirely possible

Kanto Swarms

Ponyta

Route 22 - Credit to DrCraig

Spoink

Viridian Forest - Credit to ZedEx & Benjaminvoz

Haunter

Route 10 - Credit to Mornedil

Hoenn Swarms

Rattata

Route 117 - Credit to KAR0TTENPOWER

Hypno

Route 121 - Credit to Hagure

Krabby

Route 109 - Credit to Hagure & ExpertWinston

Ponyta

Route 112 - Credit to ExpertWinston

Lotad

Route 114 - Credit to KarottenPower