To get Mewtwo, you need to trade it from FireRed or LeafGreen. You can catch it in Cerulean Cave after winning in the Pokemon League.
It is impossible to get Mew legitimately on any of the Generation III games. However, one Mew can be found on Faraway Island in Pokemon Emerald. To get there, a player would need the Old Sea Map event key item, which was only released in Japan in 2005. The player would take the Old Sea Map to the S.S. Tidal port in Lilycove city, where they would talk to the woman standing in front of the boat and then Mr. Briney. Mr. Briney would take the player to Faraway Island, where Mew could be found and caught.
Celebi is obtainable only from the Japanese Pokemon Colosseum Bonus Disc, which people received with their reserved copy of Pokemon Colosseum. To get the Celebi, the Colosseum save file must have all 48 Shadow Pokemon purified. After Celebi has been transferred to the Colosseum save file, the Bonus Disc can then be used to transfer up to 48 more Celebi to any Japanese Game Boy Advance Pokémon games as long as the player has beaten the Elite Four and saved in a Pokemon Center. The Celebi will come with the name of "Ageto".
Jiarachi can be obtained from the US Pokemon Colosseum Bonus Disc. A copy of Pokemon Colosseum is not required, and the player just needs to connect the GBA game to the Gamecube through a cable. Jirachi will appear if there is an empty spot in the party.
Deoxys can be caught on Birth Island. To get to Birth Island, a player must receive the AuroraTicket through mystery gift, and then board the S.S. Tidal in Lilycove. The player will arrive on a triangular island where they follow a moving rock until Deoxys arrives. Unfortunately, AuroraTicket events are no longer being held, so it is impossible to get Deoxys legitimately.
It is in the sky pillar
its on route 115 but you have to have kyogre,groudon and rayquaza
For Pokemon ruby you can catch the three regis, rayquaza, groudon, and latios/latias. In sapphire you can catch the three regis, rayquaza, kyogre, and latios/latias. However, in emerald you can catch kyogre, groudon, rayquaza, the three regis, and latios/latias.
Rayquaza, Kyogre, Groudon, The Regis, Latios and Latias, and a lot more.
rayquaza,groudon,kyogre,regice,registeel,regirock,latios or latias.
Rayquaza, Groudon, Kyogre, Regirock, Registeel, Regice, Latios/Latias.
wing it
a groudon and a kyogre
Go catch some other pokemons Try catching Rayquaza.
the legends found in Pokemon emerald are Regirock, Regice, Registeel, Latias, Latios, Kyogre, Groudon, Rayquaza, Jirachi, and Deoxys.(Note:Jirachi and Deoxys are not shown in the pokedex until you catch them)the legends found in Pokemon emerald are Regirock, Regice, Registeel, Latias, Latios, Kyogre, Groudon, Rayquaza, Jirachi, and Deoxys. (Note:Jirachi and Deoxys are not shown in the pokedex until you catch them)the legends found in Pokemon emerald are Regirock, Regice, Registeel, Latias, Latios, Kyogre, Groudon, Rayquaza, Jirachi, and Deoxys. (Note:Jirachi and Deoxys are not shown in the pokedex until you catch them)the legends found in Pokemon emerald are Regirock, Regice, Registeel, Latias, Latios, Kyogre, Groudon, Rayquaza, Jirachi, and Deoxys. (Note:Jirachi and Deoxys are not shown in the pokedex until you catch them)
the ones you can catch are: groudon, kyogre, rayquaza, regirock, regice, registeel, latios, latias.
Regirock, Regiice, Registeel, Rayquaza, Kyogre, Groudon, Latios or Latias