 For example, in "Pokémon Red" players can catch the Pokémon Ekans and its evolved form, Arbok, while both are absent in the wild in both "Pokémon Blue" and "Pokémon Yellow".Other Pokémon are only available when offered up as a choice.The most obvious example is the choice between three starter Pokémon at the beginning of the game; the only way to get the other two is by trading.