Every time you catch a Pokémon of a particular species, you’ll receive Candy for that species. Evolution requires a different amount of Candy for each species. Pokémon that require more Candy to evolve tend to show greater gains in CP. Evolved Pokémon generally have higher CP and HP, making them a valuable addition to your collection.
You’ll still have the same number of Pokémon in your collection after completing an Evolution. The Pokémon you selected has evolved—transforming into an evolved Pokémon—so you haven’t gained or lost in total Pokémon.
To evolve a Pokémon:
- In Map View, touch the Main Menu
- Touch Pokémon
- From your list of Pokémon, select one Pokémon to evolve.
- On the Pokémon’s summary, touch the Evolve Button.
Until you have enough Candy, you won't be able to evolve your Pokémon. You can view the amount of Candy needed to evolve your Pokémon in the Pokémon’s summary.
Select Pokémon require an Evolution item as well as Candy to evolve. There are five different types of Evolution items (Sun Stone, Metal Coat, King’s Rock, Up-Grade, and Dragon Scale) that can be used to evolve these Pokémon. You can collect Evolution items by visiting PokéStops.