The 2009 release of Pokemon HeartGold and SoulSilver on the DS stands out not just as remakes of Gold and Silver, but as some of the most content-rich games ever released in the series. An immersive world featuring both of Pokemon's Johto and Kanto regions in the updated Generation 4 mechanics of the time, these titles spotlighted a feature that remains a fan favorite after setting a high bar that modern releases still haven't been able to meet.