>>24631745It gets used to replace the bicycle, Rock Smash, and Strength.
After a certain gym, you get a saddle or reigns, or some sort of key item that lets you ride specific quadrupedal pokemon (About 6 to seven specific ones in total). Pressing on the directional pad allows you to move slowly and precisely, pressing on the analogue stick lets you move faster, with top speed determined by the which of the mons you're using. There would be around three speed classes, with specail atributes to each. Fastest goes really fast, middle ground mons can go up ledges, large ones start slow and build up to crazy speed and crash through obstacles rather than having to stop and hit a button to break them.
The ability to move large boulders and break rocks in your way would be determined by your badge count, so at a certain point, you get special training on how to teach your mons to deal with various obstacles.