Eeyah hah hah!
Quote originally posted by molepeople27:
Thank you! I read that page, but I don't quite understand how a swarm works. Could you explain? And at what point in the game would you be able to do this? Thanks
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A swarm will happen each day after you get the National Pokedex by beating the Elite Four/first storyline.
Each day, you check gate houses and they'll tell you what routes the swarms are on. You go to those routes and the swarming Pokemon will be added to the normal variety of Pokemon found there (usually in high quantities, hence swarming).