Having or not having a moon isn't part of the definition of a planet.
"(a) is in orbit around the Sun,
(b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and
(c) has cleared the neighbourhood around its orbit." [http://en.wikipedia.org/wiki/Planet#2006_definition]
Pluto meets A,B and not C.
C is there to discredit large asteroids in the asteroid belt.
Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/vvM5GkburEA/beware-the-rings-of-pluto
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