This could either be some proof that the Pokémon Let's Go Pikachu & Let's Go Eevee rumor being true, or someone sneaking in to squat on some domains.
If you were following the Pokemon rumor from yesterday, the inside scoop is that the Pokemon title heading to Switch was Pokémon Let's Go Pikachu & Pokemon Let's Go Eevee. Today we see that CSC Corporate Domains have registered domains for both games. CSC Corporate Domains is a legit company that secures domains for all different companies, but we can't say for sure that Nintendo, Pokemon Co., or Game Freak are tied to this request. What we can say is that Nintendo has worked with them in the past to secure domains, including the domains for Pokemon Sun and Moon.
If the rest of the rumor is true, we should be seeing an official reveal of the Pokemon Switch title later this month. That'll certainly give us some insight into whether these domain registrations are legit!