After the elite four you have plenty more things to do. You go to the fight area, the survival are and the resort area. (three new cities) You also can continue training your Pokemon, complete both of your pokedexes, and just do whatever you want. such as capturing Pokemon that you personally want, trying out action replay, etc.
what do you do after beating the fouth gym in pokemon pearl
the fourth gym its a fire gym
You get it from Juan in the Sootopolis Gym after beating him. Then, you get Waterfall.
You get surf for beating your dads gym.
by beating the fourth gym leader
All
Your dad in Petalburg City
Flannery's gym in Lavaridge Town.
The 4th gym is found on Lavaridge town and the gym leader is Flannery.
you go the the fourth gym in pastora and battle him
you go to Petalburg city gym to get your fourth bage and surf
In Meteor Falls after beating the last gym and getting the HM for Waterfall.