Would this team be ok to have all the way through the game?

Houndor=Houndoom- dark/fire
Magikarp=Gyrados- water
Budew=Roselia=Roserade- grass/poison
Swablu=Altaria-dragon/flying
Ralts=Kirlia=Gallade-fighting/phsychic

Other
Starter pokemon: UNSURE
Bidoof=Bibarel-normal (HM slave)

Anything works with proper training. Your team looks fine with type coverage. Gallade is great. ^^

quote Lykerok

Any team is fine aslong as you train them up well, for in-game that is. When you start battling competitivly, then you have to think about what Pokemon would be effective in your team.

True .True That is true!

I find in-game very very very easy....

I normally only catch one pokemon and finish the game with the 1 i caght, and my starter.

For Diamond I done -> Empoleon + Alakazam
Pearl -> Torterra + Crawdaunt (Traded)
Platinum -> Infernape + Alakazam

You can finish the game with just 2, and a HM slave, provided you always have plenty of HP restorers and Status Healers.

You just need some high-leveled pokemon to finish the game, and if you just train 2 you will own, so my advice, if you want to finish quickly, is to pick 2-3 pokemon from that list and train up.

OR,

Use them all and enjoy the game as much as you cam ( although when you complete Diamond and Pearl 2 times each, there's not much to enjoy >_< )