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:

NumPad9: Game Speed

Trainer Options:

NumPad1: Unlimited Health
NumPad2: Unlimited Haki Perception Gauge
NumPad3: Unlimited Full Tension Gauge
NumPad4: Weak Enemies
NumPad5: Player Invisible
NumPad6: Unlimited Range Meter Attack
NumPad7: Freeze Mission Timer
NumPad8: Easy Craft
NumPad9: Game Speed

Editor Options:

Skills: Current Skill Points
Inventory: Current Amount of Item

Notes:

EDITOR OPTIONS
For Skill Points, press M to open the menu, then select Skills, then note the value you have.  Change the value then press TAB to lock it in.

For Current Amount of Item, press M to open the menu, then select Materials, then click a heading (like Gems), then click on the actual inventory item you wish to affect (such as Gem Fragment), and note the value of the number you have is shown in the trainer.  Modify the value, then press TAB to lock it in, to have more of the item.

Unlimited Health:
Toggle on and your health remains full.

Unlimited Haki Perception Gauge:
Toggle on and the gauge remains full.

Unlimited Full Tension Gauge:
Toggle on and the gauge remains full.

Weak Enemies:
Toggle on and most enemies have low health.

Player Invisible:
Toggle on and if an enemy has not already seen you, you are likely to be ignored.  Some scripted attacks, the enemies see you due to the game script.

Unlimited Range Meter Attack:
Toggle on and the meter remains full, allowing you to attack at distance unlimited.

Freeze Mission Timer:
Toggle on and the timer countdown on certain missions freezes.

Easy Craft:
Toggle on and when you enter the craft screen, you have many items visible to craft, and they can be crafted even if you do not have the materials.

Game Speed:
Toggle on to speed up the game so you can move faster to locations.