First up, you need to beat the 4th gym leader and then, once you exit the gym, May will give you the glasses to go to the desert ruins.
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watch "how to get the three regi's" on youtube
in ruby, sapphire, and emerald, regirock is in the cave in desert ruins. to get it in firered or leafgreen, u have to trade it from ruby, sapphire, or emerald. To acsess them you must have a waillord and relicanth oh and dig. surf down the bottom of pacifalodg town
Dive near sootopolis
there are lots of special places in emerald! the battle frontier, artistan cave (smeargle) , sealed chamber, island cave (regice) , desert underpass (ditto and the other fossil you did not collect) , mirage island (wynaut) , desert ruins (regirock) , ancient tomb (registeel) , sky pillar (rayquaza) , marine cave (kyogre) , terra cave (groudon) . Key: the names in brackets are the Pokemon that can befound there.
You type wasteland.