Yes, as long as the activity that awards the Archive Book is itself allowed on side accounts. If the activity isn't permitted on side accounts (for example, anything that awards Neopoints), you cannot earn Archive Books using a side account.
Yes, as long as the activity that awards the Archive Book is itself allowed on side accounts. If the activity isn't permitted on side accounts (for example, anything that awards Neopoints), you cannot earn Archive Books using a side account.