Um not right now. I finished OR recently and I'm taking a break now. Best not to get a Pokemon overload or you'll feel bored right? Yeah you're doing really good, especially since you have a Staravia for Gardenia. Oh btw "Pokemon" is singular and plural so you don't need an "s" at the end to signify... let's say a full team of Pokemon. Lol confusing right?
Lol yeah basically you can "transport" one of your Pokemon from HGSS into the Pokewalker and then you can walk with it like outside and junk and as you're doing that it can level up the Pokemon that's in it and find items. And a little fun fact for you: researchers found that the Pokewalker was one of the best pedometers at the time when HGSS came out.
Oh yeah you're doing pretty good. A recommendation is that when Chimchar evolves to Monferno learn Mach Punch!!! I'm glad you're having fun! Pearl was my first Pokemon game so it's like special to me lol.