It has already been suggested to implement an option to search for User + Format instead of just one of the two when looking for replays.
- I think extending this and allowing to filter for certain Pokemon or even combinations of Pokemon used in the replays would make sense. (Example: All replays of 85percent, gen8OU, using Landorus-T + Dragapult).
- Still with the option to leave certain criteria blank (Example: All replays in gen8OU using Landorus-T + Dragapult - no matter the player).
- For more specific searching, certain combinations could be exluded (Example: All replays in gen8OU using Landorus-T but not Toxel).
- Lastly an option of lesser importance would be to filter for moves (Example: All replays in gen8OU using Landorus-T with Explosion + Dragapult with Dragon Dance).