However, here's how you can get them in those games:
Jirachi
* Pokémon Ruby, Sapphire, Emerald: Jirachi can be found in a special event that is no longer available.
* Pokémon Diamond, Pearl, Platinum: You can find Jirachi in a specific location by completing a special event.
* Pokémon Mystery Dungeon: Explorers of Time, Explorers of Darkness, Explorers of Sky: You can find Jirachi by completing a specific side quest.
* Pokémon Black 2 and White 2: Jirachi is available through a special event that is no longer available.
* Pokémon Omega Ruby and Alpha Sapphire: You can find Jirachi in a special event that is no longer available.
* Pokémon Sun and Moon, Ultra Sun and Ultra Moon: You can get Jirachi by completing a special event that is no longer available.
* Pokémon Let's Go, Pikachu! and Let's Go, Eevee!: You can get Jirachi by transferring it from a previous game.
* Pokémon Sword and Shield: You can get Jirachi by completing a special event that is no longer available.
Deoxys
* Pokémon Ruby, Sapphire, Emerald: Deoxys can be found in a specific location after completing the main game.
* Pokémon Diamond, Pearl, Platinum: You can find Deoxys in a specific location by completing a special event.
* Pokémon Omega Ruby and Alpha Sapphire: You can find Deoxys in a specific location after completing the main game.
* Pokémon Black 2 and White 2: Deoxys is available through a special event that is no longer available.
* Pokémon X and Y: Deoxys is available through a special event that is no longer available.
* Pokémon Sun and Moon, Ultra Sun and Ultra Moon: You can get Deoxys by completing a special event that is no longer available.
* Pokémon Sword and Shield: You can get Deoxys by completing a special event that is no longer available.
Important Note: Most events for Jirachi and Deoxys are no longer available. You'll need to check online resources or consult with a game expert for the most current information on how to obtain these Pokémon.