Hi there, it is impossile to link up a trade between your android and gba cart, but it is possible to get your save file from your android to your gba cart. First off you would need a ds lite or original as is has the gba slot and you need a slot 1 flashcart like the r4 or something similar...
my school has a chrome extension called light speed filter agent and it legit blocks YouTube pfps since the file cdn(I think aka yt3.ggpht.com) is classed as mature
It was easy to bypass some of the restrictions, as one of the admins left a registry key in the administrative shares drive, which allowed me to get around the blocking of some sites.