Monster Hunter G Cheats

Offline Color Variants
There are 3 color variant wyverns you can unlock.

MonoDevil (White Monoblos): Kill a Silver Crown Sized Monoblos
Rioheart (Pink Rathian): Kill a Silver Crown Sized Rathian
RioSoul (Blue Rathalos): Kill a Silver Crown Sized Rathalos

Trial mode
To unlock Trial mode, you must complete the quest "Jungle Menace".

Basarios' Trials: Complete "Basarios: Unseen Paril"
Cephadrome's Trials: Complete "The Land Shark"
Gravios' Trials: Complete "Terror of the Gravios!"
Gypceros' Trials: Complete "Slay The Gypceros!"
Khezu's Trials: Complete "The Shadow In The Cave"
Kut Ku's Trials: Complete "Jungle Menace"
Monoblos' Trials: Complete "Horn of the Monoblos"
Plesioth's Trials: Complete "Water Wyvern in the Desert"
Rathalos' Trials: Complete "Attack Of The Rathalos!"
Rathian's Trials: Complete either "Queen Of The Desert" or "Slay The Rathian!"

Unlockable offline elder quests
Deliver a firestone: Unlock and complete Gravimos, Diablos and Furufuru quests
Diablos: Buy a piece of Monoblos armor
Furufuru: Buy a piece of Rangosta armor
Gravimos: Buy a piece of Galeos armor
Lao Shan Long: Complete all offline quests including the alternate colored monsters unlocked by defeating a silver sized monsters (Monoblos, Rioleus, Rioleia)
Pink Rioleia and Blue Rioleus pair: Complete the firestone quest