The third evolution is Chandelure. It evolves from Lampent through a Dusk Stone. Lampent evolves from Litwick at level 41.
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Taillow does not have a third evolution.
There is no official game yet, but there are rumors that there will be a Pokemon Gray version in a year or two, similar to Pokemon Platinum and Pokemon Crystal, as if it becomes real, it will be the third game in the Pokemon Black and White games.
Nintendo has announced that there will not be a third game to be grouped with Black and White. There will not be a Grey.
Starly only evolves twice, so Staraptor is the final evolution and can't evolve. In fact, no pokemon can evolve three times, so it wouldn't be smart to assume that Starly can.
In pokemon platinum, the best party ever is Infernape, Staraptor, Luxray[third evolution of Shinx], Floatzel, Bibarel [make it learn all its moves as HMs] and Giratina.