How do you get to the battle frontier in Pokemon platinum?

First get the national dex then got to snowpoint city and talk to the boat guy then he will take you to fight area where the battle frontier is!

(from Electchu:u gotta be the Pokemon champ too)

action replay code for national dex

94000130 fffb0000

b2101d40 00000000

00001654 00010101

00001658 fffcc750

1000165c 0000fdfe

0000137c 10001fff

c0000000 0000000e

00001340 ffffffff

dc000000 00000004

d2000000 00000000

d0000000 00000000

94000130 fffb0000

b2101d40 00000000

c0000000 0000000e

00001380 ffffffff

dc000000 00000004

d2000000 00000000

d0000000 00000000

94000130 fffb0000

b2101d40 00000000

e00013bc 000000a8

32001fff 70000000

00000000 00000000

08050000 00000000

00000000 00000000

00032000 00000000

02000000 00000000

08000000 90000000

00800000 20000000

00000080 7fffffff

fffffffc fffcffff

7e7ff9e7 ff9c7ef7

ffffffff fffffeff

f8e3e6ff ffffffff

fefffff7 ff3cffff

081fffff dffffffc

ffe7ffff 39ffdfff

00000090 a2ac83fb

e4e4fefe 03020100

07060504 0b0a0908

0f0e0d0c 13121110

17161514 1b1a1918

d2000000 00000000

94000130 fffb0000

b2101d40 00000000

c0000000 000001ec

20001465 0000003f

dc000000 00000001

d2000000 00000000

d0000000 00000000