Pokemon GO often releases specimens in-game at a much slower rate than simply dumping a bunch of new additions in one big update, instead opting to introduce evolution lines, Regional Variants, Mega/Dynamax forms, and shiny variants through the likes of in-game events and special opportunities. These events tend to be focuses around the specific Pokemon that is releasing or a relevant theme, and offer opportunities for players to obtain these monsters for the first time, as well as earn a bunch of handy bonuses and rewards.