Ditto is a shape-shifter. You discover you've caught a Ditto in Pokémon Go when you, say, catch a Pidgey and then it suddenly transforms and you're looking at a Ditto instead. This inventive way to introduce the new Pokémon was a hit back in November when it first rolled out.
Now, with the major Gen 2 Johto Pokémon Go update that just took place there are some new types of Pokémon that Ditto will hide among. Here's what you need to know.
Pokémon Go Update: New Pokémon species that turn into Ditto
Early reports posted by Pokémon Go players to the Silph Road subreddit indicate that Ditto can transform from Sentret and Hoothoot, which appear to be some of the more common spawns introduced by the Johto update. This would fall in line with Ditto's tendency to transform from common Gen 1 spawns, like Pidgey.
Ditto guides from reliable sources like GamePress have yet to be updated with all the new Johto species that Ditto has been reportedly been transforming from. The Johto update is still relatively new, so keep an eye out for more formal news about a complete list of species from which Ditto may now spawn.
Check out more Pokémon Go guides, tips and tricks
If you're booting up the game for the first time in a while to get ready for Gen 2, be sure to check out Mic's guides on how to get stardust, how to determine how long it will take you to reach level 40, the kind of Pokémon you get from 10-kilometer eggs, how to create new PokéStops, how to maximize your chances of catching Pokémon and how PokéStops distribute Pokémon eggs. Also check out how to catch Gen 2 baby Pokémon, our analysis of post-balance update Chansey and Rhydon and everything you need to know about finding the long-awaited Pokémon Ditto.