Ben 10 Protector of the Earth Help for PSP??again..?

where can i find the cheat menu in the extras menu? when i hit extras menu, i only see movies, artwork,hero, enemy, boss viewer , secret and enter secret code.. i can't find the cheat menu.. Is there any other way to unlock the other aliens? (diamond head,wildmutt etc) or cheats to unlock them? last question.. is it true that if i beat kevin 5 times or collected all sumo slammer cards i am possible to get all 10.000 or 10 aliens? thank you