To obtain this you must Discipline 100 enemies.
-You will need the Discipline room Evil Symbol in Cam-pain to be able to discipline enemies(Unlocked by throwing 3 enemies).
-You will need to have the class and rank of the enemy you are capturing unlocked
-Valvatorez will also need to be a higher level than the enemies you are capturing
If you meet these requirements, simply throw an enemy into your base panel to capture them and enter the discipline room to torture them then select to extort HL, force to join party to Treasure map to complete one "Training". If you run out of actions for Disciplining, you can exit and clear a stage to reset the counter and continue.
I believe you are limited to 10 captures at a time. If someone can confirm this that would be great. Adding characters to the Discipline room gives you more moves and Unique Discipline options
EDIT: As JDuke705 pointed out the # you are looking for is the Discipline actions that reduce the SP of the enemy.