Pokémon: LeafGreen Version is an enhanced version of the original Pokémon: Green Version. Many glitches have been removed, and the random mechanics behind wild encounters have changed. This leads to very different strategies compared to our fastest runs on the original generation of games, and as a result, runs of this game see much more of the plot.
This run defeats the Elite Four and Champion twice; after the first time through is a post-game side quest in a new area known as the Sevii Islands, introduced in these remakes. Completing this quest unlocks the "National Pokédex" and enables trading with the Hoenn-region Generation 3 games (Ruby, Sapphire, and Emerald) and also gives the Elite Four and Champion new, higher-level Pokémon teams for the player to fight.