I think you can catch 6
The Pokemon you can catch without cheats are:
Palkia
Girantina
Cresselia
Uxie
Azelf
Mesprit
Heatran
Rotom
I forget the rest, but I know there's more!
Trading, Migrating, Catching the legit legendary Pokemon in pearl, etc.
you cant get every legendary of Pokemon without cheats or migrating and trading with people
migrate them from other games or trade with someone u might know
there are i think 6 but it depends if you use cheats.
it is impossible except for when you have cheats in Pokemon pearl,platinum,diamond
you cannot
The only way to get Celebi on Pokemon Pearl without AR cheats is via event distributions. However these events are no longer being held or supported for Pokemon Diamond, Pearl and Platinum.
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.
cant
in a fossil
The legendary is palkia
You can't without trading, migrating or, cheats