Best way to get trainers is too pvp battle. You get anywhere from 20 to 100+ from a fight. You also get basic cases from wins sometimes bronze. When you open those cases you get 20 trainers for basic and 25 for bronze. Also the daily event with The john cena logo which depending on what tier your on affects the amount of trainers you can get. There also the daily achievements you get some for each one and then you get 375 from completing them all plus some other things. Hope this helps.
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