Recently, I received my preordered Steam Deck, soon after I read about it beeing a perfect fit to run emulators.

Steam Deck (256GB)

• https://www.steamdeck.com/de/
• https://github.com/mikeroyal/Steam-Deck-Guide

EmuDeck

• https://www.emudeck.com/
• https://github.com/dragoonDorise/EmuDeck

RetroArch

Refs

The following search terms might help on github:

• "retroarch_system"
• "r-roms"

Nintendo DS Language

After setting up any DS game

• start it
• press both pad buttons to go into RetroArch's Quick Menu
• Select Options, disable "Boot game directly":
  • 
• close the game and start it again
• in the DS main view: go to the language settings:
  •