Hey I'm trying to make a rathian to have the ability of flying and I've seen that with this save editor is possible to do it but every time I start flying with it the game crashes, is it possible to make this not happen?
No, some skills can break your game if you put them on a monster that can't use them, the ones that you can mix are locational skills (nests, bones, minerals, etc); as long as they do not have other skills such as running or roaring that use the same button, since even if it does not break the game, your monster will move erratically