Each Pokémon is categorized into a multitude of traits, including their type, color, weight, height, and so forth. Most Pokémon can evolve into a more powerful species by leveling up, sort of like how a character in a traditional RPG can change into a more powerful level. Pokémon in the anime, have been shown to only be able to speak their name or a variation of it, excluding a select few who can actually speak English (example - Meowth). Others, such as Mewtwo and the ever popular Lucario can speak telepathically, but not directly to a human.