Alternatively, you could use a Wonder Mail code to get it.
Edit: Rank up...
Alternatively, you could use a Wonder Mail code to get it.
Edit: Rank up...
If you already have a Music Box, you dont need Rock Parts.
Rock Parts dont do anything anyway except fuse with the ice and Steel Parts to turn into the Music Box.
But I do believe it raises the chances of recruiting Regirock.
It does, so does the musicbox, I had a music box and regirock and regice(I already had regi steel) Joined my team strait away.
That was just luck.
They don't serve any other purposes besides creating the Music Box.