This app was mentioned in 5 comments, with an average of 0.60 upvotes
Local means they have to be physically near you.
If you're playing the Japanese version, you can invite friends via LINE to play. You can also use apps that post the LINE invite publicly, so other users with the same app can join. Note that the game is not compatible across different regions.
iOS (not sure what's good for iOS, there are dozens of alternatives)
Sure, I'll add you soon!
Also, for the BBS, I use this app. https://play.google.com/store/apps/details?id=jp.co.spiritek.monstmulti
I think iOS has the same app somewhere. It's a bit confusing to use, but you'll understand it somehow. Maybe someday, I'll translate it for people here so they can understand how to use it.
hi u may use this app to join game and meet new player https://play.google.com/store/apps/details?id=jp.co.spiritek.monstmulti