神のユージン

Hello, can someone give me a detailed tutorial how to add new Pokemon to the overworld? I know that there is a really old thread about the same topic but I'm new to Rom additing and have problems with it. So for example, if I wanna add Rayquaza to the BW2 overworld just like in Blaze Black 2, what do i have to do? I already watched the 'Adding NPCs to the overworld' by Kaphotics, but he mentioned that it doesn't work for Pokemons and overall I'm really confused. Any Help would be really nice