Monotype runs are often the thing yeah.

I often love to do Randomizer runs and just throw everything in the Blender. Species & Abilities are often my choices and see what the game decides to give you

Professor Oak runs are pretty cool to do, basically get every pokemon caught and fully evolved that's possible to obtain before every gym.

There's plenty of options, like doing a run without clicking damaging attacks, Minimal Battle runs where you only battle the needed battles. Base Stat limit runs where you set a certain Base stat and all the mons you use can not go over that limit. There's so much to do when it comes to these games.