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.

Trainer Options

# Player Combat 
     NumPad1: Invincible
     NumPad2: Unlimited HP
     NumPad3: Unlimited MP
     NumPad4: Super Damage

# Inventory 
     NumPad5: Unlimited Use Gives Max Item

# Gameplay 
     NumPad6: Game Speed

Editor Options

# Currency 
     Yen

# Player Stats 
     Current Health
     Current Health Max
     Current Energy
     Current Energy Max

# Player Progression 
     Current Level XP
     Current Level
     Job Rank Level
     Job Rank XP

# Selected Inventory 
     Amount

# Selected Character Stats 
     Current Health
     Current Health Max
     Current Energy
     Current Energy Max

# Selected Character Progression 
     Current Level XP
     Current Level
     Job Rank Level
     Job Rank XP

Notes

Invincible:
Most attack types don't hit the player and pass through them.

Current Health:
Player Stats can be modified, but are actually affected mostly by character level.

Amount:
If the inventory item is selectable, most will show the amount in the editor.

Current Health:
Stats can be modified, but are actually affected mostly by character level.  For Selected Character Stats, open the MENU, select, PARTY, then STATS, then select the character.