Niantic has kicked off Pokemon Go's first Bug Out event, a week-long event featuring increased Bug Pokemon spawns and other bonuses. Those include your first chance to encounter and catch a Shiny Scyther. The Bug Out event lasts till April 9 so be sure to catch Bug types such as Paras, Wurmple, and Yanma.
Pokemon Go Introduces New Bug Out Event - GS News Update
From April 2-9, Pokemon Go is hosting a Bug Out Event where you can catch a Shiny Scyther.