It's really simple: You just go in the middle of the cave.
sorry but you can't find it in Pokemon diamond/pearl without migrating regirock from Pokemon ruby, sapphire, or emerald. But I think there is a cheat on the action replay for it, but I don't know the cheat.
You can only get regirock on Ruby, Sapphire and emerald. First you need to unlock the caves. then you go to the bottom of the desert. there should be a big rock with a hole in it. go in. YOU NEED A POKEMON WITH ROCK SMASH! go up to the dots on the wall. move 2 spaces to the left then 2 spaces down. Get your Pokemon to use rock smash. a hole will appear at the top go through and there is regirock.
In pokemon platinum, go to the desert route, then go down the hill, where you should see a darker spot in the rock. That is the entrance to Regirock's cave.
First you need a Pokemon that knows Rock Smash. Regirock is found in the desert ruins on Route 111 (in the desert). Once you're in the desert, make your way South and you should find Regirock's tomb. You have to defeat the elite four. In the tomb, the Braille code reads: "left, left, down, down. Then use Rock Smash." Follow these directions; tapping the directional button to move just one step at a time. The door to Regirock should reveal itself and you can catch it. You should buy lots of timer balls. They are very usefull I got mine with them in one shot!
You should definitely get Pokémon Emerald.
There should be a move deleter in Pokemon Emerald, try to find this person and you should be able to delete your moves.
you really should get emerald cause Pokemon ruby and Sapphire are separate and emerald is those 2 put together so instead of getting ruby and getting groudon just get emerald and you can get groudon and kyroge and newer Pokemon
Migrate Regice, Regirock, and Registeel from Ruby, Sapphire, or Emerald after defeating the Elite Four. Then go to Snowpoint City, and there should be a shrine at the north. You go to final underground floor. Once you get past the ice panels and talking to it, it will battle you.Note: You must have Regice, Regirock and Registeel in your party to battle it.
easy stroomish
you should get absol
You first have to defeat lavringe towns gym leader and when you defeat them walk out and may or the boy ( don't know his name sorry) and they will give you the go-goggles -p.s. if you have sailors and the ancient fish and did this thing where three doors open obviously they are all the Regis( regice, regirock, register) if you go down all the way down the sand dunes there should be six rocks in a circle and one in the middle go in it regirock will be waiting hoped this helped and if you haven't caught regirock buy a lot of ultra balls it took me awhile to catch him-
emerald ruby