BW2 - Global Link Gym Session Events Pokemon Distribution - Event

Saw this on Serebii.net; Seems to me it's a Dream World event since the pokemon will be sent through the dream world mechanism? But what does 'Nimbasa Gym Session', 'Castelia Gym Session', and 'Virbank Gym Session' mean? I don't see any such event in Pokémon.com, is it some sort of competition or

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