Yes you can always go back and fight nascour again in realagam tower and get metagross.
Yes you can try to battle and catch Entei again if you've defeated him in Mt. Battle and in the Realgam Tower in "Pokémon Colosseum." The same Cipher Admin who has it who is named Dakim can be found as 1 of the trainers in the Deep Colosseum challenge.
at the giant hall in the swirling grass
No, mismagius was not created in the time of that game. You can catch a misdreavus though.
You can only get celebi in Pokemon XD by trading. The only way I know you can get a celebi to Pokemon XD except from events is the Pokemon Colosseum Bonus Disc.
You cannot catch a Stantler in Firered get one from Pokemon emerald or Pokemon colosseum.
Beat Evice With Pokemon Over 60's or you can beat evice with metagross lvl 70 metagross save metagross for machamp because metagross know's psychic or espeon lvl 70 because machamp know's earthquake and catch tyranitar with a master ball i think he is lvl 55
no you can catch it. However you can trade Pokemon to get geodude and metagross on black and white!
Yes you can try to battle and catch Entei again if you've defeated him in Mt. Battle and in the Realgam Tower in "Pokémon Colosseum." The same Cipher Admin who has it who is named Dakim can be found as 1 of the trainers in the Deep Colosseum challenge.
no
No you cant catch Latios in Pokemon Colosseum. You can only trade it in from your Ruby or Sapphire game in to the Colosseum game and that's the only way you can get it.
at the giant hall in the swirling grass
The final Colosseum is the Deep Colosseum after the Game, Pokemon here are Level 60-65, this is where you can catch the Pokemon you missed from the Admins earlier and a Shadow Shuckle.
In the giant chasm, you can catch them. however, i would recommend catching a metang instead, because metagross are extremely rare.
You can't. You have to trade it from Colosseum.
If you mean metagross, you beat the Pokemon league and return to steven's house in mossdeep city. there will be a pokeball on the table. it contains Beldum, and you have to train it to lvl 45. You will get the metagross.
No you will need Emerald or Pokemon Colosseum to trade you a Sudowoodo.
No, mismagius was not created in the time of that game. You can catch a misdreavus though.