Make your way through route 223. When you get to a Pokemon Centre, walk into the cave on the left and you will be in victory road.
.....The Pokemon league......
victory road
VICTORY ROAD IS BEST
victory road is north of sunyshore city a the end of the cave before Pokemon league
in twin leaf town
same as diamond/pearl
After getting all eight badges sail upwards from sunnyshore city until you get to victory road. Get through victory road and you will be at the Pokemon league.
Beat the 8th gym leader and have a Pokemon that knows Surf and Waterfall to get to Victory road. go though victory road battle your rival and there you go.
all you have to do is follow the diamond/pearl walkthrough for victory road. I suggest looking up pokedream.com
In platinum,pearl, and diamomd on the way to the victory road
Go past victory road you dummy
you find in The Pokemon League victory road when you explore your way out to the ELITE 4