How can I get iso

ProximaMidnight_8ProximaMidnight_8 Member Posts: 285 ★★
in Strategy and Tips
I'm a mostly free to play player but I will buy stuff sometimes when really good cheap offers come up. Im very low on iso lately and have enough rankup resources and probably enough gold, but how do I get more iso? is there a fast way to get 4 star dupes that im unaware of? thanks
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