the surf glitch had been modified by the makers, but in the Japanese versions ONLY can you activate it. enter the first elite 4's room. turn around, then use surf from the Pokemon menu. beware- attempting to save in the void can cause your file to be corrupt or you may be permanently stuck.
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You can't. There is only one speed to the "Surf" on Diamond/Pearl.
surf left of jubilife to canalave
The Hearthome gym leader Fantina lets you use surf in Pokemon Diamond, Pearl and Platinum.
Spheals can only be found in Pokemon Pearl on routes 226 and 230 (surf), but you might have to get the national dex first.
After getting surf, you can got to Canalave City, Pal Park, Pokemon League, and the caves in the centers of the three lakes