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HG Pokewalker (backpack):
Nanako the Hopip
Route: Rugged Path
5897 steps
292 Watts
Caught: Machop
Found: Super Repel
Bonus: 20 Watts, 1 Hard Stone
SS Pokewalker (pocket)
Astellus the Phione
Route: Night Sky's Edge
7152 steps
328 Watts
Caught: Hoothoot
Found: Stardust x2
Bonus: uhh...an item...probably a Stardust
Conclusion: Pocket produces better results.
And if you're wondering how I got Night Sky's Edge, it's from the special Jirachi I received from Gamestop. Need to borrow? Comment!