I trained a team of six, those six being Empoleon, Luxray, Staravia, Lucario, Skuntank, and Honchkrow(not the most balanced team in the world, but I love 'em all). Things are MUCH more interesting when you're not steamrolling over every trainer you encounter past the first gym or so, and you get some variety in your battles. And really, DP has so many awesome Pokemon that'd it be a shame to hold off on raising them until after I'd beaten the game.