First thing is first you need to get all the basic tools you need ... download then as without them you cant make your hack.... and you can get suugestion within this website..... and scripting is very easy with a little practice.... there are many harder things in rom hacking so scripting is just a basic.... and if you even make eevee the starter, you might be thinking to add charmander, squirtle and bulbasaur in your game,,, so i suggest you to edit it :)