When you capture a new monster, sometimes a hidden prompt appears: "Share your capture on Twitter?" If you do this (even via a dummy account), you receive . This acts like a personalized one-time code.
Here’s a review you can use or adapt for and its promo codes: neo monsters codes
Since traditional promo codes are rare, savvy players use these reliable methods to farm resources: Fortune Shrine: When you capture a new monster, sometimes a
There are no publicly active, evergreen promo codes to unlock free gems in the game right now. When you capture a new monster