So from now onwards you can find new special items, including evolution items, and use them to help evolve Pokemon. 10 sweets for a stage 2 evolution.
What are Special Items in Pokemon GO?
Included also in this huge Pokemon GO update to accompany the new list of Pokemon are new Evolution Items that are required by various Pokemon to be able to evolve. Certain Pokemon now move around much more than they used to when players attempt to catch them.
Sun Stone: According to details on Pokemon Go Database, the Sun Stone can be used to evolve Gloom into Bellossom and Sunkern into Sunflora. And CosmicPrankster also said that he spun 50 Pokestops and got 10 new berries but no evolution items.
Dragon Scale: This item comes in handy when evolving Seadra into Kingdra.
Metal Coat: This can be used to evolve Onix into Steelix and Scyther into Scizor. It is the crown-shaped relic used to evolve Poliwhirl into Politoed instead of Poliwrath.
Up-Grade: This can be used to transform Porygon into Porygon 2. The other one, which is called Pinap Berry, efficiently doubles the total amount of sweets players get from capturing species. Drop rates are a nightmare and Niantic is not divulging the numbers for these Evolution Items. In fact, there are five different special items you should start looking for as you go about becoming the very best. Trainers should bear in mind that special items, particularly evolution ones rarely make an appearance, but they should continue visiting Pokestops.
One trainer on Reddit, smokinapplepie has mentioned that he visited 20 different Pokestops and didn't get even one evolution item. The following guide shows the Evolution Items drop rate and Berries at Pokestops for the Pokemon Go Gen2.
Interestingly, a lot of Pokemon GO trainers are reporting they are getting Evolution Items on their 7th day bonus spin, but no official studies and stats have been done to prove the correlation. So you might pay attention to whether you get a special item when you hit this point or when you do your first daily spin of the day in "Pokemon Go". Moreover, a few level-up rewards also comprise Pinap and Nanab berries.
In other words, keep trying and use those berries. Meanwhile, while the servers are temporarily down, learn more about Evolution items in this latest update.