The Pokémon Company has released comparison videos that highlight how Pokémon Omega Ruby and Alpha Sapphire look in comparison to the original Pokémon Ruby and Sapphire games on Game Boy Advance. They’ve done this by recording footage of the same scenes from both games and putting them side-by-side.
To watch the comparisons properly, try to get the timestamps on both videos to line up. There’s a handy countdown before each video that should help with this.
Pokémon Omega Ruby and Alpha Sapphire will be released on November 21st in North America and November 28th in Europe.