Pokémon Light Platinum (2008)

You wake up in a mystery place and witness a fight between Arceus, Dialga, Palkia, and Giratina. "It must be a nightmare" you think. Where are you and what is going on? When the dream ends, you appear to be in your house but you get a message that the Professor need your help. Only you know the secret language of Alpha, a language passed down by your father. It is the only key to solving the problem. Did that dream have any effect on your world? Get a Pokémon, travel across the world and save it before it's too late!