What is a good team for Pokemon Black and White?

Samurott, Krookodile, Sigilyph, Eelektross, Chandelure, and Haxorus is what I would call the best. A good in-game team is one that does well against your rival, villainous teams, gym leaders, Elite Four, Champion, and other strong trainers.

What is the most op item in Pokémon?

The 10 Most Powerful Pokémon Items, Ranked