first of all you might want to go around the place searching for any rare or secret items and if your pokemon are not level 100 yet train them at a trainer bar with all the gym leaders and people you have gone with on your journey if you have done that try catching all the pokemon in pearl but these are suggestion of what to do after pearl.... :3
No, there is no short cut to the Pokemon league building in Pokemon pearl.
surf around the pokemon league
get out of victry road
in the Pokemon league. Yes, it is but you have to go through a cave to get to it. Look on your map.
finish your pokedex
.....The Pokemon league......
You dont
You have to beat the Pokemon League.
go to the Pokemon league
Garchomp go in the Pokemon league the last trainer of it.
catch all the Pokemoncatch all the Pokemon
she is in the pokemon league