Greetings Trainers!
Folks weren't expecting the release of Generation 2 until some time later this week, but Niantic surprised us by releasing Generation 2 Pokemon this afternoon at approx. 3pm PST! If you hadn't heard, the Valentine's Day 6-hour Lure event was also extended until Saturday, so you have time to use your Lures to try and lure up some Gen 2 Pokemon! New berries have also been released, which includes Nanab berries, which make a Pokemon less likely to run, and Pinap berries, which grant the trainer double candies upon capture.
Be on the lookout for prevolutions of new powerful Pokemon like Larvitar, Phanpy, Teddiursa, and Mareep! Also be on the lookout for strong Pokemon like Heracross. And if you have candies available, you can now evolve new Pokemon like Blissey, Scizor, Porygon2, and many more! Maybe pop a Lucky Egg before you do and go on an evolving spree while reaping the benefits of all these new Pokedex entries!
UPDATE 3:30pm PST: Apparently moves have also been re-balanced. More on this as we learn the details, but moves like Psychic, Flamethrower, Dazzling Gleam etc... have been given new damage outputs. For now, catch everything you can and try not to transfer too much!
e.g. Confusion now has 20 base damage, and Psychic is a 100-energy 100 base damage move.