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a bit complicated but here i go
overpower:
all your stats get averaged and compressed in one single stat, excluding hp, the boost cant be higher than 255 and can be only used once in a battle, like z moves, how would it work would be something like this
lets say you have a cacturne, cacturne stats are
70
115
60
115
60
55
if you overpower lets say your attack, all of the other stats bar hp would average to add cacturne's attack up to 255, so, you need to substract to defense/special attack/special defense and speed in equal ammounts, cacturne needs an extra 140 points to achieve 255 attack, 140 divided by 4 (defense, special attack, special defense and speed) gives you 35, so you take those 35 points of each stat and add them to attack, so for that turn where you click the "overpower" button, the stats would look like this:
70
255
25
80
25
20