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All of the protagonists have a severe, critical mental illness induced by a Parasect-tier fungus in their heads that causes them to hear voices in their head.
These illnesses tell them things such as what Pokemon is to be sent out next by their opponent, what Pokemon attack them in the wild, and other dialogue boxes.
Merely turning it off in the options menu just disables the visual representation of the fungus, the protagonist will still hear it in their head, it just won't be displayed to you, the player.
Because the player has yet to have a doctor identify the fungus and remove it, he/she assumes that everyone in the world has the ability to hear these voices. They themselves are not even aware of the fungus on their head.
Ironically enough, it's always covered up by a hat.
