Pokémon Emerald Rogue

When you go on an adventure all routes, encounters and items will be procedurally chosen based on your progress into a run

After a certain number of routes you will encounter a random gym leader who will have a procedurally chosen team of their assigned type; as you progress further into a run gym leaders and other trainers will start using more difficult setups for their pokemon.

If you can make it all the way to the champion and defeat them, then you will have completed the run!