In the deep darkness of Undead Cave, Grady and Parker give you the Entrastone that gives you the ability to travel to Entralink 2. When you go a girl if your playing as a boy and a boy if you are playing as a girl comes up to you and tells you about the new entralink. In this entralink you can sync into the secret Hiro Region. In this region you can catch ANY pokemon. In rainbow grass you can catch legendarys but in regular grass you catch regular pokemon