April Fools 2018
The 2018 April Fools Event was an event that was only available for users to participate on April Fools, 01/04/2018, and was declared as 'Special Easter Event' as an addition to the Easter Event 2018.
During this event, players were "fooled" by the not static easter eggs which moved around the page while trying to click on them.
The users had to find five different easter eggs and click on them fifty times, so they would count as 'found' eggs on the Special Easter Event page.
After finding all five easter eggs, one received an event egg which didn't hatch, no matter how many times it reached max EHPs. This egg was transformed into the April Fools Event Pokemon Keggleon on April 2nd.