I did over 1600 fights with him in a row for his 3rd girl and didn't get one, so yeah GL m8 with that.
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Why bother leveling up any girls other than 3 best same as your type girls? Just check wiki which one have best same stat as your main girl and level them up. And frankly speaking even if 3 girls with that stat you leveled aren't the best ones, there is enough of low level shit geared barely upgraded people on PvP that you don't really need to min-max anything.