Remote Control Hobby Shop

Hey Everyone!
I have always loved Generation III Pokemon games. Over the past couple of months I've gotten into Generation IV games. I've beaten HeartGold and I just bought Platinum. I have been thinking up a team for when I start playing. I have only been able to come up with the first five members. I would appreciate some suggestions for the sixth team member. The first five are as follows:

Umbreon: Great special tank and dark types are always great.
Alakazam: Pretty good special sweeper plus psychic is a great type.
Weavile: A Physical sweeper as well as an ice type that can take care of a lot of different types
Crobat: Something to annoy. I'll use confuse ray, toxic, etc and chip away at some tough foes.
Infernape: Solid mixed attacker, and it should serve as a nice additional sweeper.

I would love to hear what you have to say about the sixth member! Any and all suggestions are appreciated. Thank you!
PS I will only be playing the story, no WiFi battling...yet.