My Black team is
Hydreigon: mild; dragon pulse, fly, fire blast and dark pulse. Chosen ecause Hydreigon was one of my fave pokemon released this gen, answered my prayers for a dark/dragon, and is downright awesome if bloody difficult to raise (got him as an egg).
Volcarona: rash, heat wave, bug buzz, quiver dance and psychic. Again hard to raise because his previous form (also raised from an egg) favours atk while his nature is made for sp atk, but like the Hydreigon, totally worth it now he's grown up. It's been commented on by by opponents that he must have very good speed ev's, because even without EV training he's faster than a volcarona should be.
Serperior: bold, strength, leech seed, toxic, leaf storm. Yeah her nature sucks, but I soft resetted for ages for a girl, and wasn't prepared to keep going until a got a girl with a good nature.
Mienshao: adamant, u-turn, jump kick, fake out, acrobatics. I loved the elegant design of this pokemon, and mine has been the gem of my team. She's fast, versatile and her attack is just stupid. Oh, and regenarator+u-turn is amazing.
Seismitoad: neutral, rock slide, brick break, surf, earthquake. Planned to raise a Simipour, but this darling ended up carrying my team instead. She can take a hit.
Musharna: neutral, hypnosis, dream eater, charge beam, nightmare. It was either Gothitelle or one of these, so it'll be Gothitelle in a future game. Her hp can really absorb some special damage, and she really is a nightmare after a few charge beams!
I only learned about EV training after this team, sadly, but I wouldn't change a thing about them. They whipped every gym leader-in game, and Hydreigon, Volcarona and Mienshao haven't done badly competitively, either.
STack - I will vouch for Galvantula. Mine has bug buzz, thunderbolt, energy ball and thunder wave, and along with the ability compoundeyes he is AMAZING. And mine is neutral natures, so if you had one with +sp atk...yowza.
