check out my video on how to set up an R4 card for homebrew: https://youtu.be/i4lHXez837o
The DS has proven itself to be a homebrew machine, but what homebrew games are you going to choose? Here are some of my recomendations.
links:
DScraft: https://dscraft.github.io/
Starfall: https://www.gamebrew.org/wiki/Starfall_DS
Super Smash Bros Crash: https://www.gamebrew.org/wiki/Super_Smash_Bros_Crash!_DS
Counter Strike DS: https://www.gamebrew.org/wiki/Counter_Strike_Nintendo_DS
Mario Bros Wii DS: https://www.mediafire.com/file/4gl4seibzlw0wll/NSMBWDS+Final+Ver.+2.1.0.rar/file
Notepaint: https://www.gamebrew.org/wiki/NotePaint