Snorlax Event

The Snorlax Event was a Japanese regional event to help revitalize the areas affected by the Kumamoto earthquakes last April, Snorlax has increased spawns in all of Kumamoto Prefecture, as well as Yufu, Ōita and Beppu, Ōita. The event launched on March 4 and continued until March 13.

Background
The approximate translation for the event announcement was:

"We've received information that in the Kumamoto prefecture and in Oita prefecture, Yufu city and Beppu city, Snorlax has begun appearing more frequently. Was it roused by the Pokémon flute? The phenomenon is expected to continue from March 4 to March 13. There are areas and places where local reconstruction work is continuing. Do not enter a dangerous place. Otherwise, please enjoy Kumamoto and Oita!"