The More you Battle, the Stronger you Get
If you send Pokémon out into battle, they get stronger and develop in amazing ways. They collect Exp. (experience) for every victory in battle. And when they have enough Exp., they level up, raising their stats. Raise your Pokémon with special care to make them strong.

Level up to Evolve your Pokémon
Some Pokémon can evolve into other Pokémon. There are several different ways to evolve a Pokémon, but the most basic way is to battle and gain Exp. Ex/ Gible→Gibite (first evolution)→Garchomp (second evolution)
•Other primary ways of evolving Pokémon
-Use a stone
Many stones, like the Moon Stone and the Thunderstone, conttain hidden powers. Use one of these on a Pokémon to trigger an instantaneous Evolution.
-Develop a friendship with the Pokémon
As you raise and care for a Pokémon, it can become more attached to you. Some Pokémon will evolve once their affection for you reaches a certain threshold.
-Meet a certain condittion
Some Pokémon will evolve if certain conditions are met, such as if you keep them in your party, or if they know a certain move while leveling up.
-Trade with a friend
Some Pokémon evolve when they're traded. Some of them need an extra kick from items like Dragon Scale.