Max skills' events are unlocked after some part of the story (like listed in the sticky). To view the events Max can NOT be in your party. To remove him you have to go in his office in his base, go see the event, get him back in your team, go back to where the event was and get the skill.
Grand Marshal/Gladiator Priest, Lightplol. PvE gladiator holy paladin, Lightp.