No, there are no cheat codes for MechQuest.
MechQuest is a browser-based MMORPG by Artix Entertainment. Because it runs entirely on their servers, the developers maintain strict control over game balance and progression. Traditional cheat codes (like those for offline console games) do not exist, and attempting to use third-party "hacks" or trainers violates the Terms of Service and risks a permanent account ban.
Enjoy the game as intended—the challenge is part of the fun!