What would be considered the ultimate team (pokemon diamond and pearl)?

I suggest you ditch this team. A good 4 pokemon Team that is unstoppable is actually a level 100 Spiritomb, 100 Pikachu, 100 Sablye, and level 100 Kingdra. If you go to Pokemon.Marriland.com you will see it has a pokemon team builder and this team only has 2 super effective 2types against your team. This team is the team I have and I have won over 128 wifi battles and Im taking this team to the Pokemon Diamond and Pearl Video Game Showdown this summer in NYC.