Activating this trainer:
Press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey.All hotkeys can be changed on the trainer.

Trainer Options:

NumPad1: Infinite Health
NumPad2: Infinite Heat Gauge
NumPad3: One Hit Kills
NumPad4: Change Money By 50000
NumPad5: Change CP By 5000
NumPad6: Change Item ID Of Selected Slot By 1
NumPad7: Super Speed
NumPad8: Slow Motion
NumPad9: Unlimited Item Usage
NumPad0: Infinite Weapon Durability
NumPad/: Perfect Singing Score
NumPad*: Perfect Dancing Score
NumPad-: Perfect Batting Rank
NumPad+: Easy Dart
NumPad.: Change Item ID Of Selected Equipment By 1
Page UP: Set Usages Of Selected Equipment To 99
Page Down: Set Ammo Of Selected Equipment To 99
Insert: Infinite Sunshine Fever
Home: Change Legend Level By 1
End: Max Out Run Points
F1: Easy Phone Club Heart Filling

Editor Options:
Misc: Money
Misc: CP
Selected Item Slot: Item ID
Selected Equipment Slot: Item ID
Selected Equipment Slot: Usages
Selected Equipment Slot: Ammo
Selected Equipment Slot: Has Item (0/1)

Notes:

Money / CP: Open your ingame menu where money is shown and press hotkey or use editor.

Selected Item: Mouse HOVER the item slot in inventory, wait a second or two and press hotkey or use editor. Leave inventory and come back to see changes.

Unlimited Item Usage: While active you can use the currently equipped item as many times in a fight as you want. Does not work for all 'items' such as objects / weapons you pickup.

Infinite Weapon Durability: While active the currently equipped object / weapon will not break.

Perfect Singing Score: Activate this option only AFTER you started a song (else nothing happens).

Easy Dart: While active its not important how good you are as you will always win the dart game.

Selected Equipment: While active open your equipment screen and mouse HOVER the item, wait a second or two and press hotkey or use editor. Leave equipment and come back to see changes.

Sunshine Fever: Activate option and gain some fever to make it instantly infinite.

Legend Level: Open ingame menu and click on abilities. Now select your fourth ability where a level is shown at the bottom right. Press hotkey or use editor then close and come back to this screen to see it has changed.

Max Out Run Points: While active you have maximum score.

Easy Phone Club Heart Filling: While active it doesn't matter what you are saying to the girl, the heart is instantly filled on first question answered.