>>19131255You do have to wait in real time for more people to show up, but you can use the normal Writ of Invitation, which is available at the start, to speed things up slightly. After you defeat 40 trainers, you'll unlock the Silver writ, which makes them appear much, much faster. The Writ of Challenge and the Red Writ raise opponents' levels, and the Gold writ increases how much money you get.
You can tell Audino trainers by their appearance - they're always Furisode Girls (girls wearing Japanese outfits). They don't appear at the lower ranks, so you have to rank up a bit before they appear. Once you've defeated every single trainer, you'll unlock the Black writ, which raises every opponent's level by 20, which is how you get the Level 65 Audinos.
Also, keep in mind that the writs are expensive, but you should make the money back pretty quickly. Using a Black, Gold, and Silver writ simultaneously will cost $500,000, for example, but if you use the Amulet Coin and O-Powers, you can make that back in literally ten minutes.