Can I still get Shadow Links without Streetpass?

I just started playing The Legend of Zelda: A Link Between World and found the guy talking about StreetPass and fighting Shadow Links. problem is that where i live i get next to no hits on StreetPass even when i left my 3DS on while going to work both in the game i was playing at the time and in StreetPass Mii Plaza

I saw there are a bunch of challenges and wouldn't mind aiming to clear them too but i assume i need to fight Shadow Links to be able to do them, in which case, can I still get Shadow Links without Streetpass? or can you only ever get them from StreetPass?