Okay ive been messing on PES 08 for a while and i now think ive cracked diving although this may be seen as cheating the game konami put it there to be used so why not

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When to dive ( i think )
when i dive i mostly do a dive just after a sliding challege that the computer or another person has done but i dive if he misses the challenge but dont make it to obvious to the ref soon as he slides you dive and you should get a freekick/pen works for me.
my other way is when ur in the box and want a pen wait for 3 or more defenders to gather around you and block the refs view ( make sure theyr blockign the view ) and when they stick there foot it to get the ball dive and you should be awarded a pen

happy diving.
and thank you for reading.