You have to trade from either Ruby, Sapphire, or Emerald to get them.
No. You have to trade from another game.
ImpossiBle Unless you trade them to leafgreen or firered which sux
No you cannot get the regis nor any hoenn Pokemon all must be traded to you from ruby, sapphire and emerald.
All 3 must be traded from either ruby, sapphire or emerald.
No you can't but you can get them in Platinum Emerald Ruby & Sapphire I think so or maybe Firered & Leafgreen too you can only get Reggigigas in Pokemon diamond in the snowpoint temple.
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.
There is no Pokemon convention in firered.
To get Pokemon firered on PC download a vba and Pokemon firered ROM
Yes there are shiny Pokemon in firered
Regigiggas is in there but you need to have the other three regis.
It is not possible to get a ninth badge in Pokemon FireRed. You can only get eight badges in Pokemon FireRed.
You cannot get it in Pokemon FireRed. It doesn't matter because it is not necessary in Pokemon FireRed.