New Super Mario Bros. 2 on Nintendo DS? Doesn't Exist—It's on 3DS

Does not exist.

• New Super Mario Bros. 2 → Nintendo 3DS (2012).
• New Super Mario Bros. (1) → Nintendo DS (2006).
• New Super Mario Bros. U → Wii U (2012) / Switch (Deluxe, 2019).

You likely want New Super Mario Bros. 2 on 3DS, or the original NSMB on DS.