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>Pokemon Mega Stones are now items you place in your bag or hold
>Once per dungeon you make go into your Mega evolution
>The form dissipates when you leave the dungeon, step on a wonder tile, or trigger a special trap
>Can have IQ skills that boost your mega form's power, number of uses, or cannot lose your stone/ prevents stones from getting sticky
>Swap items like those in Explorers become available for those who don't have mega evos and work like faux mega evolutions, with power slightly less but similar duration
>May encounter a wild pokemon that can mega evolve on its own or find and pick up it's mega stone in dungeon and use it
>or some global imbalance junk allows mega evos without stones at will but with limited time uses as listed above