Uhm... if by transfer you mean trade Pokemon... then no. However, if you're going there, we need the wonder card which would require a backup of your SAV. If you backup your SAV no data will be lost. Don't bother going there if you're going to waste the wonder card though The PKM will be relatively easy to find, but the WC will not. Also, if I recall correctly, the tanabata distributed last year was only distributed to some lucky lottery winners, so you may want to check if it's available to everyone or only those who win the lottery.