So, my suggestion is make a mega evolution box that will give us mega evoution pass like "blue orb for 3 days" instead of loot balls. And the price of that box will be high (too high). As the pass has a limit of time, there will be a ending of mega evolution and people will grind money to buy it more than one time and get correct pass. The box will give us random pass and we can use a pass only on one pokemon. May be you can understand what I'm saying...
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knightking