Disgaea7: How to max classes quickly

How to max classes quickly. First unlock carnage dimension, having 10 million in stats by usiung image change and secret recon evilities.
Get 3 glasses with class proficiency++ obtainable through U.Overlord evil gotcha while maxing stats
Have rising heaven sword ability or big bang, obtainable at sword/fist mastery 50. I use skill shop to teach the skill from Fuji.
Equip the class proficiency evilities obtained from the gotcha system.
Classes upto ranger take 1 battle. Ranger to Mecha Girl take 3 battles, Mecha Girl and celestial hostess take 7.

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