4th Gen Need one more pokemon for my team

[Tom2]

So I'm at my wit's end here on which pokemon to fill my last slot with. I'll list of my team members but before I do that there are a few things I want to let you guys know.
1) I am using Pokemon Pearl
2) I don't like training Legendaris or Pseudos and I dont like training pokemon that level slowly
3) I realize that some of my team has "Undesirables" for a lot of people but I like these pokemon so I'm keeping them anyways.

Team:
Infernape
Kricketune
Pelipper
Gardevoir
Rotom

 

[ImLethe]

If you know how to get a shiny stone, Roserade could be a cool addition.