You'll have to trade Regirock from Ruby, Sapphire, or Emerald.
You get a regeirock by trading it from ruby sapphire or emerald. that's how you get it to fire red.
sorry, you cant...
You can't.
you have to finish the machine on island one to trade with the ruby, sapphire, and emerald versions.
there is no regirock in Pokemon pearl,migrate please to get regirock
Regirock is a Rock type pokemon.
Regirock does not evove
You can only get Regirock by transferring a Regirock from Pokemon Ruby, Saphire, or Emerald to the Pal Park I believe.
how do i get regirock
Regirock is unobtainable in firered you must trade one from ruby, sapphire or emerald.
to get regirock in Pokemon platinum, you have to upload it from ruby, Sapphire, or emerald.
The only Regi you can get in Pearl in Regigigas But to get Regirock Regiice and Registeal get them in Sapphire Ruby and Emerald Firered or Leafgreen srry to say that folks
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.