The method is simple and is easily do-able for anyone. Okay, so you want to fill up your Pokedex, but you can't be bothered going on every single day to see what you've obtained via SpotPass? simple... Just put your 3DS into sleep mod. you should have obtained 3 new pokemon via spot pass. then go into the settings of your DS and put the date forward. You can then collect another 3 Pokemon in the same day, you can do this as much as you want and will easily fill up your Dex.