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I don't have much experience with b/w but I know for a fact Haxorus and Excadrill are two good Pokemon to have. Especially when you've given Excadrill Speed and Attack EVS and Haxorus Attack and SP.Def EVS
A good Team to have using 5 spots is Torterra, Togekiss, Weavile, Alakazam and Magnezone. If you o get the team, the last spot can be used for a Pokemon of choice
The first shiny I ever encountered was a shiny Zubat in Meteor Falls in Pokemon emerald which I trained into a lv.100 Shiny Crobat, cloned it and gave it out to my friends