Is Pokémon Black Version on Steam?

No. Pokémon Black 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 Black Version on?

Pokémon Black Version is available on Nintendo DS.

When did Pokémon Black Version release?

Pokémon Black Version was first released on September 18, 2010.

Pokémon Black Version

Sep 18, 2010Role-playing (RPG)Turn-based strategy (TBS)AdventureNintendo DS

Pokémon Black Version — frequently asked questions

Is Pokémon Black Version on Steam?: No. Pokémon Black 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 Black Version on?: Pokémon Black Version is available on Nintendo DS.
When did Pokémon Black Version release?: Pokémon Black Version was first released on September 18, 2010.

About Pokémon Black Version

Pokémon Black Version and Pokémon White Version are the primary paired versions of Generation V. Black and White follow the trends set up by previous games in the series. Two player characters (one male and one female) travel a new region, Unova, on their Pokémon journeys. This region is inhabited by various Pokémon, and unlike before, none of those available prior to Generation V can be obtained before completing the main story by defeating Team Plasma. The games' names were revealed on the official Japanese Pokémon website on April 9, 2010, and scans from the subsequent issue of the magazine leaked the following day, April 10. Pokémon Black and White are followed in 2012 by two sequels, Pokémon Black 2 and White 2, which are set two years after the events of Black and White. Black 2 and White 2 are the second and final paired versions of Generation V.

Summary via IGDB.

Pokémon Black Version on Wikipedia

Pokémon Black Version and Pokémon White Version are 2010 role-playing video games developed by Game Freak and published by The Pokémon Company and Nintendo for the Nintendo DS. They are the first installments in the fifth generation of the Pokémon video game series. First released in Japan on 18 September 2010, they were later released in Europe, North America and Australia in March 2011. Sequels to Black and White, Pokémon Black 2 and Pokémon White 2, were released for the Nintendo DS in 2012.

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