Actually, I think GB Sounds is messed up. A few of the tunes—New Bark Town, Azalea Town, and the Johto Encounter Theme are the only ones I can think of at the moment—sound differently than they did in the original version. I thought maybe it was because the latest Silver I played was on a ROM, but I found a GBC and my old copy of Silver, played it a bit, and found out that it's the same in the actual game card as it was in the ROM. It doesn't make much sense...
It's because the games use midis (or something similar to it), and the DS's sound card is different than the GB's, so it can't perfectly emulate the GB sounds.
Gah, Suicune is hard to catch! I threw about 45 balls at him, ran out, and still didn't get him. I need to go stock up on more dusk balls, then wait for night. On a side note, Suicune's theme is my favorite of the three dog's/cat's battle themes.


