The Ryujinx team has just added a major feature to their Nintendo Switch emulator. Builds with LDN3 are now available, which offer ldn_mitm support. This milestone allows Ryujinx users to play together with those on hacked Nintendo Switch systems running CFW. Normally, this would only function so long as users are both on the same network, but there's a workaround that you might be aware of: the switch-lan-play tool. There are guides available that can allow a computer to act as a host for an online game, allowing users to play a wide variety of games together, online, and now, regardless of whether or not you're on actual hardware or using an emulator. Lan-play supports lots of games, including the recently released Pokemon Scarlet and Violet.
Prior to this update, only games that had a "LAN mode" could communicate across Switch and PC hardware; this is unfortunate as only about a dozen or so titles actually support this feature. That barrier is removed with ldn_mitm. Games such as Super Smash Bros. Ultimate, showcased above, can now achieve interconnectivity with a hacked Nintendo Switch when the ldn_mitm submodule is used.
That's not all, either; this latest build of Ryujinx also offers a big performance upgrade for those Pokemon titles, as well as making Splatoon 3 playable on AMD GPUs, and fixing Animal Crossing: New Horizons so that the intro can be played without having an existing save file.
The 'same network' is important here and is technically exploitable to allow long-distance communication, if you have a second PC lying around to act as the lan-play console host. It gets complicated fast with all the network jargon, but there is a guide up on lan-play's webpage if anyone is interested.
For most users, this feature simply enables all those non-LAN compatible games such as Animal Crossing, Super Smash Bros, Pokémon Scarlet/Violet, Mario Party and many other titles to connect to their PC (or Steam Deck!). On the other hand, if you're a professional network engineer and/or have a spare PC lying around, then we're sure you can think of some ingenious ideas!
Ryujinx emulator LDN3 build download