If you mean the OG DS Japanese Tomodatchi Life, I suggest playing it on a DSi XL (LL). Assuming you mean the multiregion 3ds, more popular Tomodatchi Life, it can be played on the following consoles (and their Japanese variants): 2ds, New 2ds XL, 3ds, New 3ds, 3ds XL, New 3ds XL

Obviously the 'New' variants play the best, but any of those consoles can play it perfectly well. :3

2ds