《宝可梦 朱／紫》将以开放世界的形式来丰富地呈现故事舞台，玩家能在其中自由自在地冒险。
无缝衔接的辽阔自然风光与城镇街景，以及生活在此的宝可梦们。
包括天空、大海、森林、街道，玩家在这个世界的任何角落都有可能看到它们的身影。
本作将维持《宝可梦》系列特有的与宝可梦对战并捕捉的经典玩法，是一部老少皆宜的开放世界作品。

2022年2月27日に『Pokémon Presents 2022.2.27』で発表された[注 1][1]。 本作の特徴として、オープンワールドを採用している[2]ことが挙げられ、「豊かに表現された世界を、自由に冒険すること」が可能な「子どもから大人まで誰もが楽しめる」[3]タイトルとしている。

An ancient evil has returned to Baldur's Gate, intent on devouring it from the inside out. The fate of Faerun lies in your hands. Alone, you may resist. But together, you can overcome.

The land of Faerûn is in turmoil. Refugees cross the wilds, fleeing the helltorn stronghold of Elturel. A vicious cult marches across the Sword Coast, uniting every race of monsters and men under the banner of a cryptic god they call the Absolute. Chaos strikes at Faerûn's foundations, and none may escape its talons. Not even you.

The grotesque nautiloid ship appears out of nowhere, blotting out the sun. Its writhing tentacles snatch you from where you stand. The mind flayers have come, imprisoning you on their ship, infecting you with their horrid parasite. You will become one of them.

By fate or fortune, you survive when the nautiloid crashes in the Sword Coast outlands. You set out for civilisation, desperate for a cure for the parasite festering in your brain, only to take centre stage in a conspiracy that runs as deep as the Nine Hells. New enemies await.

As for old foes... the shadows stir.
And all roads lead to the legendary city of Baldur's Gate.