Catch the seed Pokemon that is seen walking in the river. That is one of the new research task descriptions in Pokemon GO as Niantic Labs has created a new event to celebrate and promote the new movie Pokemon: Detective Pikachu. All the new research tasks are based on the trailer.
That includes, "catch the seed Pokemon that is seen walking in the river."
Catch the Seed Pokemon That is Seen Walking in the River
The challenge is fairly simple: catch a Bulbasaur from the wild. Bulbasaur is a rather rare Pokemon to find, so it will be difficult to catch, but the event is making Pokemon that are seen in the trailer more likely to spawn. So Bulbasaur is more likely to be seen in the wild.
Players can also catch Pikachu with a detective hat on, though you can only catch one per day.
Photo courtesy of Niantic Labs