I'ma be honest

So I have a young nephew who loves playing the DS/3DS along with getting into the Pokemon series(over the switch which shout out to him). And obviously these games ain't getting cheap right now, so I'm looking for a [insert number] in 1 flashcart so he can just pick from a huge number of games . Yes I could do it myself but right now life is super busy and can't get to it so a plug n play would do HUGE numbers hell I may not be in the right reddit page if anyone can help a brother out please don't be shy