Hey there, welcome to the community! I haven’t made a deep analysis about the in-game viability, even though @Boggaspotatoe tried if I remember correct. Nonetheless, Electric, Ice, Ground and Steel are the types I’ve seen the most success with.
If you need anything, feel free to ask. I’m doing competitive guides and analysis here and I frequently give advices against key trainers like Elite 4 among others. I’m also trying to finish the game without a Pokémon fainting. In any case, welcome again!