Am I able to edit/modify Moves and/or Abilities without making my own mod?

I've been wanting to do reworks to certain Pokemon or even just certain moves that pokemon learn, but after going through the files of my Modpack it seems like this isn't possible at first glance. Is there any way that I am able to do things like (permanently) changing a moves BP, Accuracy, PP, Secondary Effect, etc. or is this datapack territory?