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:
NumPad6: No Training Cooldown

Trainer Options:
NumPad1: Change Money
NumPad2: Quick Sell
NumPad3: Max Relationship
NumPad4: Perfect Plant Quality
NumPad5: Fast Growing
NumPad6: No Training Cooldown
NumPad7: No Watering Cooldown

Editor Options:
Player: Money

Notes:

Quick Sell:
While active just tip on a dealer to instantly sell. No need to hold the button down for a while.

Max Relationship:
Chat with an NPC to get a perfect relationship.