Can you catch Darkrai on Pokemon sapphire?

No, you cannot catch Darkrai in Pokemon Sapphire. Darkrai is a mythical Pokémon that can only be obtained through special events or by transferring it from another game where it is available.

Darkrai was introduced in the fourth generation of Pokémon games, which includes Pokémon Diamond and Pearl. It cannot be found in any of the third-generation games, such as Pokémon Sapphire.