What games should I legally acquire for it? I had the various DS/3DS Zelda's, most of the pokemans up to Black, Bravely Default, The World Ends With You (which i never completed because I was bad at fighting on two screens at once), and Contact (which I never completed because it was made by Suda51). I'm leaning towards steali getting some of the later pokemans because I 100%'d Cassette Beasts and I crave more creature collecting, but is there any other good stuff?
Buy a decent memory card. There's free shops you can go ham and download everything you can to. You didn't need a giant card, I think 256 or 512gb would be somewhat affordable for most these days, and just download all you can. All the classic Nintendo games are great. There's a lot of hidden gems too for sure.
Be sure to grab the Virtual Boy emulator that came out recently. It works flawlessly and it's a sight to behold
Apparently my model doesn't play nice with 128gb and bigger cards, so I've resigned myself to a measly 64GB of space.