Talk:Porunga's Wishes/@comment-36708106-20180825101241/@comment-32271305-20180825101807

From the in-game news: "Porunga Dragon Ball Campaign: Day 4" - One Porunga Dragon Ball will appear in the game every day during 8/21 - 9/10 PST.

It's also explained at the top of this page, "each day you can collect a Dragon Ball via various ways, with a hint provided on how to obtain it." That's why there are only 4 hints at the moment.