How do you skip the Pokemon league in Pokemon pearl?

Answer 1

Do you mean victory road? To get through victory road,you should buy repels and have rock climb, surf, strength, rock smash and waterfall. Now you should go. Here's a guide:

Cross bridge, cross bridge, cross bridge, Rock climb, west, up stairs, fight trainer, north, up stairs, up stairs.

Smash the south rock, head south. Use strength. Move northeast boulder down,

move north boulder west and last boulder south 2x. Head west. fight trainer,

Move west most boulder down once. Run around and smash rock. Move boulder

again north 2x. East, follow path. Smash the rock. fight trainer, Move northern most boulder east, head north, fight trainer,

down stairs.

Cross bridge, rock climb, west, north, follow path, fight trainer

down stairs.

Down stairs, down stairs, surf east, surf north, fight trainer, waterfall, follow water

path, surf again, follow water path, up stairs.

West, take first path south, south,

east, rock climb, north, cave exit.

Answer 2

I think using action replay you can walk through the doors, by using the walk through walls cheat.

Answer 3

use rare candys on a Pokemon