Which platform received Pokémon Ruby and Sapphire first?

Pokémon Ruby and Sapphire were first released on the Game Boy Advance.

The games launched in Japan on November 21, 2002, and began Pokémon’s third generation. They introduced the Hoenn region, 135 new Pokémon, abilities, natures, double battles, Pokémon Contests, and Secret Bases.

The Game Boy Advance provided more processing power and a larger color palette than the original Game Boy and Game Boy Color. Ruby and Sapphire also used a battery-backed real-time clock for features connected to the passage of time, although the generation’s original games did not retain the previous generation’s day-and-night cycle in the same form.

Pokémon Omega Ruby and Alpha Sapphire later remade the games for the Nintendo 3DS. That later platform is therefore associated with the Hoenn story too, but it was not the system that received the original Ruby and Sapphire releases.