Obtainable Through Regular Gameplay
* Rayquaza: Found on the top of Sky Pillar after defeating the Elite Four and becoming the Champion.
* Groudon: Can be found in the Cave of Origin, but only if you chose Treeko as your starter.
* Kyogre: Can be found in the Cave of Origin, but only if you chose Torchic as your starter.
Obtainable Through Cheat Codes or Events
* Mew: Only obtainable through cheat codes or save file modifications. No legitimate way to catch Mew in Emerald.
* Celebi: Only obtainable through cheat codes or save file modifications. No legitimate way to catch Celebi in Emerald.
* Latias/Latios: These are event Pokemon that were available at specific times in Japan. You can obtain them through save file modifications or specific events like the "Mystery Gift" feature, if you have a Japanese cartridge.
* Jirachi: Only obtainable through specific events and cannot be caught through normal gameplay.
Important Notes:
* Version Exclusives: Groudon is exclusive to Pokemon Emerald, while Kyogre is exclusive to Pokemon Ruby. You can't get both without trading.
* Events and Cheat Codes: Using cheat codes can potentially disrupt the game's balance and make the experience less enjoyable. Be sure to use them responsibly.
* Save File Modifications: Modifying your save file can void your game's legitimacy and make it incompatible with official online services.
Let me know if you'd like more information about any of the legendary Pokemon or how to obtain them through specific methods!