Activating this trainer:

If not state otherwise below, press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.

Promo Options:

Stats: Current Level

Trainer Options:

NumPad1: Unlimited Health
NumPad2: Unlimited Full Drive Gauge
NumPad3: Unlimited Full Phantasm Gauge
NumPad4: Super XP Gains
NumPad5: Unlimited Seals
NumPad6: Unlimited Master Health
NumPad7: Instant Special Attacks Cooldowns
NumPad8: Unlimited Combat Item Consumable Use

Editor Options:

Stats: Current Level
Stats: Current XP
Stats: Current QP Credits
Stats: Current Attack Power
Stats: Current Defense Power

Notes:

EDITOR OPTIONS

For Stats, once you are in combat portion of the game, note the values are filled in and you can change them, then press TAB to lock them in.  Some values may work only in the combat session that is current and may reset once you leave the mission.

Unlimited Health:
Toggle on to keep full.

Unlimited Full Drive Gauge:
Toggle on to keep full.

Unlimited Full Phantasm Gauge:
Toggle on to keep full.

Super XP Gains:
Toggle on and you gain XP much faster.  You can change the value added using the trainer.

Unlimited Seals:
Toggle on, enter the Seals screen, then leave, then re-enter and you have 3.

Unlimited Master Health:
Toggle on and for many missions the Master Teammate health resets when attacked.

Instant Special Attacks Cooldowns:
Toggle on and many of your skill attacks that have a cooldown are ready to be used again quickly when you use them.

Unlimited Combat Item Consumable Use:
Toggle on and using items in combat from the quick bar (such as heal) will reset to 9 when used.