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The Alien Ant Farm version of the song is on Rock Band 2 as Downloadable Content.
The Little Rascals Version 2-0 - 2001 was released on:
USA: 6 August 2001
Rock climb is near a house/hut on the way to snowpoint city, if you then go in the house a man will give you an icicle plate.
hope this helped
its in the house in mauville city at the right of the shop.
Unfortuately there is no downloadable content for the PlayStation 2 version of Rock Band.