doesn't matter.
I don't think you can get regirock in pokemon ruby.
to get regirock in Pokemon platinum, you have to upload it from ruby, Sapphire, or emerald.
in ruby there's groudon, raquaza, regirock, (if you consider it a lengendary) regice, and regirock
You can only get Regirock by transferring a Regirock from Pokemon Ruby, Saphire, or Emerald to the Pal Park I believe.
Regirock
In Diamond you can't catch Regirock, you have to migrate it from Pokemon Ruby, Sapphire, or Emerald.
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.
you can find the legendary Pokemon regirock
You can get the regice, regirock, or registeel.
you can gain regirock by getting the national pokedex the going to pal park then transferring it from Pokemon ruby or emerald then cath it
in Pokemon sapphire/ruby you need to go under water in go into the grass it might take a while but keep trying and don't give up.
u have to migrate them from ruby Sapphire emerald