Pokemon Evolutions Episode 8 English Dubbed Episode Title:The Discovery.Episode Description:Green searches for the 150th Pokemon in order to complete her Pokédex, and notices Trace entering Cerulean Cave with the same goal. Upon confronting Trace, she declares that she will compete to catch the Pokemon first. She later discovers that Elaine has already beaten them both to capturing it, which is revealed to be Mewtwo, prompting Green to challenge Elaine in order to see Mewtwo in battle, but is defeated. Green returns to Professor Oak's lab and apologizes for being unable to complete the Pokedex, before she is reassured by Oak that she was part of a collective effort together with Trace and Elaine toward its completion. Oak is informed of the discovery of Steel-type Pokemon, and he declares that the Pokedex is not yet complete.