The Korean ratings board is listing something called, according to Google Translate, “Sun and Moon, Pokemon Special Trial”. It’s likely this is referring to a Pokemon Sun and Moon demo that could be hitting the 3DS eShop soon.
Keep in mind this is not an official announcement. It’s bizarre that nothing about this demo was mentioned in last week’s 3DS-centric Nintendo Direct, though the game received a rating the day after this Direct aired. Even if it is official, it’s also not guaranteed it’d be a worldwide release, though why wouldn’t it be? Pokemon is too big a franchise to restrict a demo to a specific region.
The timing adds up for a Pokemon Sun and Moon demo, though, as the game releases November 18. This would be a first for the Pokemon franchise.