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:
NumPad3: Unlimited Items Use

Trainer Options:
NumPad1: Unlimited HP
NumPad2: Unlimited SP
NumPad3: Unlimited Items Use
NumPad4: Game Speed

Editor Options:
Player Stats: Current HP
Player Stats: Current SP
Player Stats: HP
Player Stats: SP
Player Stats: ATK (Base)
Player Stats: MAT
Player Stats: DEF
Player Stats: MDF
Player Stats: AGI
Progression: Level
Progression: Current XP
Currency: E Currency

Notes:

EDITOR OPTIONS

Once you are in the game, most of the values will automatically fill into the editor.  You may have to enter the STATS or INVENTORY menus to see some items fill in.  Change the value then press TAB to lock it in.

Unlimited HP:
Toggle on and the trainer will try to keep at 100%.

Unlimited SP:
Toggle on and the trainer will try to keep at 100%.

Unlimited Items Use:
Toggle on and when you use/consume and item, you have the max amount of it available.

Game Speed:
Toggle on to speed up some of the game movement, etc.