The EMS USB Cart (also available from the fine folks at nonfinite electronics)
for Game Boy is pretty fantastic: it is big (64 Mbit), cheap (~US$40), and has
a replaceable battery. This project aims to provide portable flasher software
for use on operating systems such as Linux. In theory it runs anywhere libusb
runs (Linux, BSD, Mac).
There is no official package available for openSUSE Leap 15.4