Seasonal

Seasonal Monsters are exclusive to certain Seasons observed throughout the year. They are only available during a short window of time for purchase and/or breeding, making them some of the more elusive monsters found in the game. They become available during their specific Season. For example, the Yool becomes available during the Christmas Season. It is possible to acquire these monsters "out of season" through Daily Deals but only for a very limited time. The way they work is similar to the Celestials in Dawn of Fire (not including the Galactic Cubes of course); each Seasonal having their own Season that they come out during.

Seasonal monsters can't be bred with other monsters, which also means they cannot breed with their rare counterparts. They don't appear in the lists of monsters that can be used in the Breeding Structure.

There are 6 Seasonal Events, or Seasons


 * Spooktacle - With Punkleton
 * Festival of Yay - With Yool
 * Season of Love - With Schmoochle
 * Eggs-Travaganza - With Blabbit
 * SummerSong - With Hoola
 * Feast-Ember - With Gobbleygourd

The chances of breeding these monsters are very low.

Feeding Monsters
Each monster needs to be fed four times before it reaches the next level. Increasing the monster's level increases the coins earned per minute, as well as the maximum coins earned.

More info can be found in this article.