please help I have done what google has told me to do I went 6 steps down and 9 steps to the right but nothing has happend what am I doing wrong??
At the very back of the tunnel, you'll find what appears to be an empty room with a curious circular pattern by a wall. From the center of that circular pattern, you have to head six steps south, then nine steps to the east. Face south (without taking a step south) and press A to find a hidden switch. Trigger that and you'll open up the door to Regirock's chamber.
This video will help you out too.