* The Onix line is the only multi-stage evolutionary family which can be completely acquired with [[in-game trade]]s. However, this is only possible in {{game|HeartGold and SoulSilver|s}}, in which the player can trade {{p|Bellsprout}} for Onix in [[Violet City]], and any Pokémon for Steelix in [[Olivine City]]. | * The Onix line is the only multi-stage evolutionary family which can be completely acquired with [[in-game trade]]s. However, this is only possible in {{game|HeartGold and SoulSilver|s}}, in which the player can trade {{p|Bellsprout}} for Onix in [[Violet City]], and any Pokémon for Steelix in [[Olivine City]]. |