How To Level Up Your Pokemon
IF you’ve played any of the previous Pokemon titles, you’ll know that eventually, you’ll have the chance to catch duplicate Pokemons (i.e. encountering and capturing Pokemon you’ve caught before)..
NEVER miss the opportunity to capture these (duplicate) Pokemon! These are the only way to level up your Pokemon, afaik..
So what do you need to do?
You have to choose which one of the duplicate Pokemon you have you want to retain (you might want to choose the one with the highest CP), and then transfer the “weaker” one to the Professor in exchange for candies (these are Pokemon specific)..
Pokemon level up and evolve by eating candy specific to their species.
So trade-in your extra Pikachus to get some Pikachu candy that can be fed to your Pikachu or Raichu.
Players will want to get in this habit early if they want their Pokemon to be strong enough to hold down some gyms when they hit level 5.
This process is all done by selecting the Pokemon option on the menu screen. Each Pokemon has the Transfer button available to cash it in for candy.
Each Pokemon will also have a Power Up and Evolve button. Power Ups will also require Stardust, which is acquired by catching Pokémon, hatching Eggs, or transferring a Pokémon to the Professor.