If I'm right about Charge Shot, if you evolve it all the way to V, it becomes Exorcist Arrow, a beastly Holy-element skill that can let you 2-3 shot all the Yakumo Temple Bosses even if you're lv27+ with the right buffs (Fierce God's Focus).
If only Momotarou's skill evolution wasn't RNG-based..... I'd hunt for a bow with Charge Shot then evolve that baby to V. If I'm right on Charge Shot V = Exorcist.
Some non-elemental skills become pretty awesome at certain ranks. I'm trying to get to 33 so I can see if that lv33 sword with Spirit Empty Sky Slash VI is actually a Holy skill, and if Void Lightning Slash V removes its Pierce element in place of Lightning because the only reason it doesn't hit as hard as it should is because a looooot of mobs resist Pierce (seriously, is this their way to gimp bows or something?).
Skill Evolution makes me so excited on what would happen to the skill on the next rank, but the current implementation of it is.... blerghhh.