Mythical Pokémon have finally been confirmed for Pokémon GO – starting with Mew and featuring Professor Willow as a main role. The official announcement from the development team at Niantic is as follows:
A series of mysterious happenings is occurring all over the world, and Professor Willow is seeking Trainers to help him find out if this is connected to the Mythical Pokémon Mew. These research tasks will become available to Trainers around the world later this week!
There are two different types of research you can contribute to: Field Research and Special Research. Gather Field Research tasks by spinning nearby PokéStops, which will give you objectives that include discovering and catching certain Pokémon or engaging with battles, among other things. Special Research may be requested by Professor Willow himself, and will take you on a journey to make important discoveries!
Both types of research offer great rewards, including a variety of useful items and even encounters with certain Pokémon! You can complete as many research tasks as you want every day, leading to a full day of adventures. These tasks also have different levels of difficulty, so the more challenging a research task is, the greater the reward waiting for you.
You can earn one Stamp per day by completing at least one Field Research task, and when you obtain seven stamps, you can achieve a Research Breakthrough to receive even greater rewards! You may even have an encounter with a Legendary Pokémon!
Research tasks will provide interesting challenges that will help you get better at discovering, battling, and catching Pokémon! We’re excited to see your contributions to the exciting field of Pokémon research, and we can’t wait to hear about the adventures you have along the way! Let’s get moving!
—The Pokémon GO team
Source: Official Pokémon GO blog