Alpha Nitemary is a tough Dark-type Pal you can encounter in the Feybreak update of Palworld. It’s a stronger version of the regular Nitemary and has a darker, more menacing look. As a Dark-type, it has skills related to shadows, such as using dark energy attacks or causing effects like fear or confusion. Because it’s an Alpha, this Pal has better stats overall, meaning it has more health, higher attack power, and better defense than a regular Nitemary. This makes battling it much harder.

https://screenrant.com/palworld-how-to-find-beat-alpha-nitemary/