Get a power gain team. Wolvie+CM or Phoenix+Cyclops. Then do quests. Usually its best to do the hard mode to gain power while fighting. For easy, just let the lower rating opponent beat them till 2 power bars and release.
Thanks for the constructive feed back! i used a 20% power gain team and exploring beginner and normal event quests I will see how far I get if I get the 25 units I'll be happy trying to 100% LOL soon.
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whenever bishop parries, he gains extra power.
and if you could finish the fight with around 90% maxed power, you could start your next fight with 1 full bar of power.