I don't see the point. Shaman are a wonderful class, probably one of the best duos. But you would get a lot more out of just about anything. Paladin for rez/tank, sk or war for tank, necro, mage, or chanter for pet tank/dps, wiz, druid for evac/dps, rogue, monk, ranger for just added dps, a lot more than what a second shaman would give.
About the only thing that wouldn't add much would be a second shaman or a cleric. Or a bard, but if you want to play a bard a pocket shaman is still nice to have.
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