Event pokémon, also known as Eventmon, are pokémon that are found via special conditions. Some of these conditions include:

  • Specific days of the week.
  • Specific times of the day.
  • Having a specific item.
  • Entering certain contests. (EX.: The Wish Jirachi contest)
  • Participating in certain events. (Ex.: Easter Events, Halloween Events, Special occasions such as 11/11/11)
  • Buying DP items / pokemon

They do not appear in the results of Mapdex searches because they are not normal, every day pokemon.