one has rocks and the other doesnt
There are different names for that. You could call it a rock slide, a land slide, a mud slide, or even an avalanche, as in "an avalanche of rock landed on my car."
mud slide is same as land slide when there is heavy rain in mountain region mud gets wet & slides down the hill slopes
landslide, rock slide, debris slide
it is a flow of mud down a steep slope
use rock or ground pokemon. EXAMPLE: Ground Marshstomp/Swampert: Mud Shot Rock Geodude/Graveler: Rock Tomb/Slide
They can be either: a rock slide could be quick and sudden, while a mud slide may begin and remain slow, or speed up once on the move.
Mud slide is not a move, mud slides are placed in the game too prevent you from reaching certain areas but if you use the mach bike's speed you can easily go up the slide.
A slide of hot mud, also known as a mudflow or debris flow, is a fast-moving mixture of water, rock, and mud that flows down a slope. These slides can be triggered by heavy rainfall, volcanic eruptions, or earthquakes, and they can be very destructive to surrounding areas. The hot mud often contains volcanic ash or other debris, making it particularly dangerous.
Mud
A tsunami mud slide land slide etc
Mud slide
Pikachu does not learn Rock Slide from level. I think that you have to teach it Rock Slide.