>>50719850It's a cope for pokemon being stale. They hope that adding a new type will mix things up in a substantial way, when in reality whatever gimmick they add will just be more transient garbage like gigamaxing and z-moves.
also the most likely type would be Sound seeing as it's already a thing in the game anyway. Although "most likely" here still means not a snowball's chance in hell. Just that it's more plausible than dumb shit like "cosmic"