Yeah, Chain Trigger is not what I'd call an essential skill for a Gunner. But, then again, Gunners have barely anything to pick from - Gear is an almost must, Zero Range Advance is a might, Attack PP Restorate is a probably should, and that's about it. Judging from the data that Japanese players are providing, Showtime isn't something you should be excited about, Aerial Advance, with it's 1.2 modifier, is very underwhelming... And you are only left with Chain Trigger and stat ups.
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