can someone help me find this DS game?

so not really a huge pokemon fan and don’t know much about it but i’m buying a sort of late Christmas gift for my long distance boyfriend and I’m trying to buy the pokemon black and white version 2 DS game but when i search it up it seems to be almost like none existent, it use to be up on ebay but its sort of like gone?? or theres only the Japanese version and when i search up on google i get it but its these shady online stores I’ve never heard of before and its just so frustrating..so i’m wondering if anyone knows where i can buy it from online? on an actual site thats trusting, any advice would be seriously helpful