Back when the 3DS still had an eShop, it was home to a series of downloadable games called The Denpa Men. That series will soon live on in the form of The New Denpa Men, an upcoming free to play game for Switch. While most of the game will be a single-player RPG, it does promise to have a feature in which 4 online players can team up to catch special Denpa Men.
Official description:
Scour radio waves for the DENPA MEN: small creatures that call these invisible signals their home. You can’t see them with the naked eye, but you can find them and catch them on the Nintendo Switch system! THE NEW DENPA MEN is a free-to-play RPG where you can collect these DENPA MEN for your party and adventure with them as your companions. In addition to the main adventure, there is plenty of fun to be had, like decorating your island, fishing, participating in limited-time events and playing against other players’ DENPA MEN.
I've never played the games in this series, but the wacky Japanese concept and art style are certainly appealing. The trailer states that players will get to team up to unlock special Denpa Men, so here's hoping the co-op feature will be worthwhile!
The New Denpa Men will launch on July 22. It will be free to play.