Great Ball

A great ball is an improved pokeball type. Using it, the chance of capture is even greater, but it is harder to find in pokestops. Its look is a white part, like every pokeball, and the other part blue. She has red stripes.

You'd better spend it only on new and not so strong Pokemon or pokemons you already have, but with a high CP. Remember: if you are a low CP Pokémon, prefer the pokeball.