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and here's a goofy dex i did where everything has access to some kind of sleep inducing or otherwise sleep related move or general design. sleepy, lazy, lullaby singing, hypnotizing, stuffed animal hugging, etc... Then I just spun a set of gyms and e4 out of what the dex left me with.
The rival team varies pretty dramatically but always retains a mix of Grass, Fire, Water, Ghost, Psychic, Fighting, Ground, Poison, and Fairy.
Also the evil boss' team all preys on sleep: Spore, Hypnosis, and Yawn for set ups, then WakeupSlap, DreamEater, Uproar, and Nightmare.