The Letter and Piplup

[SEQUEL TO THE GLISTENING EMERALD]
One day, Dawn, a girl from Twinleaf Town recieves a letter from her cousin Brendan in the Hoenn Region. He told her all about his journey, his friends, and his amazing experiences. When Dawn's mother tells her that she isn't mature enough to visit him, she decides to prove herself mature by going on a pokemon journey through the mysterious Sinnoh Region. Who and what will she encounter in the mysterious and extensive Sinnoh Region? You'll just have to turn past the cover and find out for yourself.