For each group of Yo-kai Medals presented, select one or more of your favorites and then press the "Pick" button. Eventually, your favorite Yo-kai Medals will start appearing under "Found Favorites". You can continue as long as you like to construct an arbitrarily long list of your favorites. In principle, the result will be perfectly accurate, provided you pick consistently - you'll correctly get your second favorite second, even if it's pitted against your absolute favorite early on.

The design, code, and explanation for the favorite picker were NOT made by me - they were made by the incredibly-talented antialiasis, xfix, and draav, for the Pokemon site Cave of Dragonflies. In addition, credits to Sofuto, Komabassador, and Frost Shogunyan for their work on a comprehensive Puni Puni/Medaland Yo-kai Medal digital scan spreadsheet, as well as sharing that with me. The dedicated contributors to the Yo-kai Watch Wiki were also an immense help, and they are numerous! A lot of my work here has simply been collating and presenting others' work - they're doing great all their own.