How do you get lopunny in platinum?

To get a Lopunny into your pokedex go to Sunnyshore city then go to the beach west of there. go until you find a girl on the road above the beach. Her name is beauty Nicola. If you have action replay you can catch the Lopunny so you don't need to evolve your buneary.

it's a little confusing but i hope it helps =)