From Pixelmon Wiki
The Bird Fossil is a Fossil that hails from the Galar region that can be combined with either a Drake Fossil or Dino Fossil when it is put into a Fossil machine to create Dracozolt or Arctozolt, respectively. It is obtained by cleaning the corresponding covered Fossil in a Fossil cleaner.
Main article: Rock Smash (External Move)
|Bird Fossil||All Forests
|Yes||Max Y 32||5|