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In Pokémon ORAS, you randomly receive Super Secret Bases through the BuzzNav, which picks from passersby, acquaintances, and friends. I've had to wait for quite a while before randomly getting a base from people in my friends list.
Is there a way to ensure you'll receive a friend's base instead of relying on random chance?
The two bikes are necessary for getting some items in a variety of areas including the Safari Zone and various Mirage Caves. To get both bikes, you need to advertise Rydel's Bikes to 3 different people throughout the region
Once you have spoken to all three of these characters, return to Rydel's Cycles in Mauville City and he will give you the other bike, so you now have both bikes at the same time.
I found the list of ranks by number of flags obtained on GameFAQs forums:
Secret Base Guild Rank Rewards:
Bronze Rank - 30 Flags - Blackboard
Silver Rank - 100 Flags - Jukebox
Gold Rank - 500 Flags - Mood Lighting
Platinum Rank - 1,000 Flags - Confetti and Garchompite
Best Answer
When you create a base, you also get a QR code associated with this base. All you have to do is to scan the QR code of your friend's base. Then, if you go to the location of your friend's base, you will be able to find it.
For that, your friend needs to share his/her QR code with you. He needs to go to the PC in his base, and to use the "Manage QR Code patterns" option. If he then select "Share a Secret Base", and then "Your Message", he will get a screen with the associated QR Code.
On your side, you also need to go on your base's PC, and select the "Manage QR Code patterns" option. Then use the "Find a Secret Base" option, and you will be able to scan the code.
You might have to wait after midnight for the base to appear on your game.