What do you do when you have beaten all 8 gyms in pokemo n emerald?

after u have beeten the 8th gym leader you want to get a water type Pokemon so u can teach it waterfall. than u take ur Pokemon that knows surf and u surf all the way down to the Pokemon leuge when ur about to enter victory road there will be a water fall. that's when ur Pokemon needs to use waterfall. at the top is a Pokemon center and the enter to victory road. after victory road there is the elite four i hope u beat them i did .... ur best bet is for one of ur Pokemon to know earthquake...... if u have a Pokemon over the level of 60 that knows earthquake and u have alot of elixers, and full restores then u will beat the elite four for sure. have fun and kick some butt.