There is an infinite life code which I haven't tried so it might not work but it probably gives you 99 lives The code is : left , right , left ,right , right , right , up , down and square. By title screen they mean before you press START . It may give you 99 lives or it just never takes any lives away . Very useful in Cloud 9 .An alternative is killing sheep all day !
Yes I did post in the Is spyro 4 to easy post or something like that and I went on about it having 25 levels and trailer differences and that rubbish .
Hope this helped ,