Combat Points (CP) was first introduced in the mobile title Pokémon Go.
It was a way for the game to judge how strong a Pokémon is against other pocket monsters, and it now makes it way over to the Nintendo Switch games Pokémon Let’s Go Pikachu! and Pokémon Let’s Go Eevee!
In the core RPG series of games, a Pokémon’s strength was always judged by its level. The stronger the level, the better the Pokémon, but Let’s Go changes this formula by offering CP and levels at the same time.
In short, Combat Points in Pokemon Let’s Go in the combined statistics of that Pokémon. It combines statistics like HP, attack, etc, and times it by different factors to give you the Pokémon’s CP.
However, due to a Pokemon’s nature, which can negatively affect some statistics, getting a perfect CP value for a Pokemon is incredibly difficult. Serebii.net created a list of each Pokémon’s best statistics, so you can get an idea of how strong your Pokémon actually is.