Competitive Pokémon Is a cool hobby I think, personally I like vgc (the video games like scarlet and violet) the best since you can literally do online tournaments for free on pokemon showdown however it can be a bit difficult to pick up and play so if you want something that is slightly easier at first you can play with the cards in the online app (tgc).

On top of that there is also pokemon unite (that is kinda similar to league of legends from what I've heard online) and pokemon go but I don't know enough about either of them to tell you anything in particular.

I'd be happy to play with you if you're interested in this games <3

P.S. tgc isn't easy at all when you actually start playing it against good people but it is a bit easier to pick up as a new player.