Is this a good wifi team for pokemon black?

Well you didn't give any information about what Ev's and Iv's you gave them. Also it would of been nice if you would of said what item they were holding. Because your Ev's and held item completely change the strat for each pokemon. The team is basically looking good but you should also know what pokemon are going to be revenge killers, sweepers, tanks, and support. For more info on this check out Smogon University for (D/P). It gives you a list of all the the D/P Pokemon with many strats attached and how the pokemon is used in competitive battle. For B/W Pokemon just search in google the Pokemon's name followed by Smogon (for example: Excadrill Smogon). Hope I helped!