It depends on what you mean by "best."
Yes.
There are no cheats without action replay for pearl but there are glitches but if some of them require for you to do the Pokemon trading thing do NOT do them because the Pokemon company can ban you from trading.Just search Pokemon pearl glitches I know there's tons of them.
the best Pokemon you can catch in Pokemon pearl is heatran
unless you have action replay then i doupt there is cheats but on the bright side there would be glitches
You mean glitches. No, since the game is DS, with the wireless stuff and all, its a heck of alot harder to do that. So i dont think there are any glitches for Diamond and Pearl.
i think that the best Pokemon you can ever have in Pokemon pearl is Empoleon or Palkia not rare^ rare^
a super rod is the best rod in Pokemon pearl/dimond/platnim
You have to migrate most of the legandarys on to Pokemon pearl but there are some tricks and glitches i know off that might help. So any way some legandarys such as palkia or garintina can be caught on pearl but you need master balls to catch them normally.
it depends who your facing.
Pokemon pearl
Google Pokemon diamon glitches sorry im not much help
Giratina