I found that Multiple Mario Games have subcategories for relays ( https://www.speedrun.com/multimario?h=3D_Mario_1862-Relay&x=02qlyopk-0nwpy2x8.zqoe4z5l ), and I wonder if you could add a relay subcategory under Main Series Glitchless.
Most rules are the same as Novecta (Gen 1-8 incl BW2) (JP). Additional ones for relays are the following:
- You must have at least two people on a team to submit a run.
- Games must be run one at a time. A runner can start the next game as soon as the timing of the previous game has ended.
- Timing ends once the last runner finishes their category.
The following playlist has our runs: https://www.youtube.com/playlist?list=PLBaIQD9kUbuRP85irLcUGpHJY4cLDh87f