Pokemon Heart Red

The story is a modified retelling of Pokemon Red. While Red is the main focus, a lot of the dialogue and several elements were from FireRed. Basically, the story is about Red and utilizes some elements from Heart Gold.

Features:
Heart Gold is Gen 4 but is originally Gen 2 and Red is Gen 1 but you start off using Gen 1 Pokemon. In fact, you can catch a lot of the later Generations. You’ll also encounter characters from Gen 1 as well as those from Gen 2 which doesn’t really happen until later. A lot of the elements are from Heart Gold like stats, moves, and others. You’ll get your way around if you already played both games.

Source: TheGamesDB