As discussed in the rest of the thread, you can use gbarunner2, but it doesn't always work very well, and certainly not as well as injections made with NSUI.
Right, forgot about NSUI
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Do not get the Omega Jr for the GBA, it can't use cheats.
Nah, I'm just getting an R4 3DS Gold Pro SDHC 2020 Card. I think it has a time bomb, though