Is Pokémon Ruby Version on Steam?

No. Pokémon Ruby Version is not distributed on Steam, so there is no Steam Charts or SteamDB player count for it. Its live popularity is tracked here via Twitch viewership instead.

What platforms is Pokémon Ruby Version on?

Pokémon Ruby Version is available on Game Boy Advance.

When did Pokémon Ruby Version release?

Pokémon Ruby Version released on November 21, 2002.

Pokémon Ruby Version

Nov 21, 2002Role-playing (RPG)Turn-based strategy (TBS)AdventureGame Boy Advance

Pokémon Ruby Version — frequently asked questions

Is Pokémon Ruby Version on Steam?: No. Pokémon Ruby Version is not distributed on Steam, so there is no Steam Charts or SteamDB player count for it. Its live popularity is tracked here via Twitch viewership instead.
What platforms is Pokémon Ruby Version on?: Pokémon Ruby Version is available on Game Boy Advance.
When did Pokémon Ruby Version release?: Pokémon Ruby Version released on November 21, 2002.

About Pokémon Ruby Version

Sequel to Pokémon Gold and Silver Versions (1999), Pokémon Ruby and Sapphire Versions offer 135 new Pokémon, more complex battling and training systems, new crime organizations, a longer and more story-focused campaign and upgraded graphics to create a new and technically improved Pokémon experience.

Summary via IGDB.

Pokémon Ruby Version on Wikipedia

Pokémon Ruby Version and Pokémon Sapphire Version are role-playing video games developed by Game Freak and published by The Pokémon Company and Nintendo for the Game Boy Advance. They are the first installments in the third generation of the Pokémon video game series, also known as the "advanced generation". After years of Nintendo being the sole publisher of the franchise in all regions, The Pokémon Company co-published the games for the first time since the establishment of the joint-owned company in 1998. They were first released in Japan in late 2002, and internationally in 2003. Pokémon Emerald, a third version, was released two years later in each region. Remakes of the two games, titled Pokémon Omega Ruby and Alpha Sapphire, were released for the Nintendo 3DS worldwide in November 2014, exactly twelve years to the date of the original Ruby and Sapphire release date, with the exception of Europe, where it released a week later.

Source: Wikipedia (text under CC BY-SA 4.0).