>>313401011. Go to fortune teller tent and hope that you get the 2x FC when talking to VIPs / Guests.
2. Have 10 guests added on your VIP list.
3. Most of your VIPs / guests must have a red chat bubble.
(All of my VIPs have festival rank 100+ they mostly give me 23,30,45 fc or 46,60,70 with 2x FC)
4. Talk to all your VIPs (10x) / other guests that have a red chat bubble.
5. Save game by connecting to the Internet (Icon bottom-right of the touch screen)
6. Disconnect from the Internet / Leave the festival plaza by pressing X then Y
7. Reset your game by pressing L + R + Select at the same time.
8. Return to Festival Plaza and all your VIPs / guests will still have the red chat bubble and they usually have the same questions / answers giving the same FC every time.
9. Do steps 4 – 8 over and over again