Can't you install Retroarch with emudeck and use that frontend to play GBA instead?
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I just use whatever emudeck has by default, I don't worry about stuff like packaging formats
Retroarch for everything that it will run well. Mgba on retroarch for sure
I don't like Retroarch or rather I don't want to l learn it since it's a bit complicated
For everything old school I use retroarch, I basically only play up to ps2 anyway, that way I get my playtimes added up on retroarch if that's something you care about