
I have downloaded the latest retroarch build but i can’t find citra coreYou have a couple of options if using Citra 3DS emulator: via Retroarch (using Citra's core) or via Android/Linux setup on your Switch (running Android/Linux port of the Citra).
However, I haven't tested any of those options personally, so I'll leave it to you. Someone else can probably tell you more about the pros and cons of either setup.

CItra core for Switch is available only by becoming a patron on the developer's patreon. I believe this is the one: https://www.patreon.com/m4xwdevI have downloaded the latest retroarch build but i can’t find citra core
Thank you so much for the info.You have a couple of options if using Citra 3DS emulator: via Retroarch (using Citra's core) or via Android/Linux setup on your Switch (running Android/Linux port of the Citra).
However, I haven't tested any of those options personally, so I'll leave it to you. Someone else can probably tell you more about the pros and cons of either setup.
Android does not run nearly good enough for that on the switch performance is hella badYou could install android on the Nintendo switch and install the citra APK. Now if you want to have the switch system and the Android system make partitions.
On my switch runs 30fps the citra emulator so I though that. Sorry.Android does not run nearly good enough for that on the switch performance is hella bad