Well you cannot CATCH Regigigas without the other 3 Regi's. Your only other options are trade with someone that does have one, use cheats on an r4 or buy an Action Replay
Hope this helped :)
no
regigigas
Get The 3 Regies And Go To The Cave In Snowpoint City.
you can use cheats or have a regigigas from the 11th movie
Migrate them from hoenn
IN D/P and platinum after you get the regies you need to have the three regis in your party and off you go to snowpoint temple to catch regigigas
You will need the three Regies (Regirock, Registeel, Regice) from diamond pearl, actionreplay... however, to catch you will need 3 other Regies or a Regigigas from the other games in order to catch the three Regies on pokémon platinum. After you caugth those Regies, you can catch Regigigas at snowpoint city temple. Another way is to get a lagre steek of won battles at the battletower to battle the tower tycoon, he has a Regigigas in he's party. After you saw Regigigas you can trade him via the global trade system (GBS).
no you need to have the three regies in your party to make regigigas appear
You can catch Regigigas via special download
Regirock, Regice, and Registeel (and for that matter, Regigigas) are unobtainable in Fire Red and Leaf Green.
you have to get a movie regigigas and then you have to go and get registeal regiice and regirock then you go to the sacred place in snowpoint city go through the maze and at the end you (you must have the regies in your party)your can get regigigas at level 1
you need to go to snowpoint city and go to snowpoint temple BUT to get in YOU NEED TO GET THE THREE REGIES HOPES THIS HELPS:)