For those running the iOS 10 beta we have good news. Yo-Kai Watch Wibble Wobble now supports the new OS, and it has been updated with a new "Befriend-a-Boss" event. That's right, you can now friend three of the eight bosses: Slimamander, SV Snaggerjag and Sproink.
The bad news is you need a lot of Y-money after you friend them to turn them into Rank S Yo-kai. The bosses you friend are originally Rank B, but you can transform them into Rank S by fusing them with special items found in the Crank-a-kai during the event period. This is expensive because it costs 3,000 Y for each crank of the machine.