Problem with Pokemon Platinum

[fearcube3]

hey guys i have a problem with pokemon platinum... the story has changed a little..i mean that when i arrive in Veilstone city my rival should help me beat up the galactic team after i met him at the gym...but after that he wont show up and then i find him later in another city...so i cant go on with the story...i used some cheats but i dont this that the cheats could be the cause...help me pls