VBA is the best and most popular Gameboy Advance emulator around. Emulates GBA, GBC, SGB, GBA roms! Supports ZIP-ed roms, so that after downloading files from the net you don't even have to un-zip them
I may try the new ram site, and download more RAM to my Switch. Not sure if ddr3 is the right ram
for it tho. Edit- no it uses floppy Ram, just like @AncientBoi