First of all, Pluto is not a planet. It was considered a double planet because its largest moon Charon is half its size.
That's easy its pluto
They call Pluto the double planet because rather than Charon simply orbiting Pluto, the two objects revolve around their common center of mass, which lies outside of Pluto.
No, because Pluto has been reclassified as a dwarf planet. Dwarf planets are not planets, despite the confusing term. Before Pluto was reclassified as a dwarf planet, sometimes the Pluto-Charon system was thought of as a double planet, so you can sometimes find that in outdated but authoritative-seeming references.
yes
Charon. It's more of a satellite than a planet, unless you want to consider Pluto/Charon as a double planet. That's a little awkward, since Pluto has been downgraded to a planetoid.
None. Pluto-Charon was almost considered one in 2006, though that would be a dwarf double planet rather than a true double planet as Pluto is not a planet. In billions of years the Earth and Moon will be a double planet. Also, the question is non-sensical because if it was a double planet then they would both be planets... so there would be no moon. A planet would be considered a double planet with it's opposite planet, not moon.
Earth. Almost a double planet, until Pluto and Charon were identified.
Some consider it to be a double planet or, more properly, a double dwarf planet. However it is currently not officially considered as such.
Pluto, it is now a dwarf planet or planetoid.
Pluto and Charon are the closest bodies in our solar system to an answer to this question, however, neither is a planet. Pluto used to be, but times change. When Pluto was a planet, it and its moon, Charon, were the closest in size of any of the planets. Currently the planet and moon with that distinction is the earth and its moon, the Moon. But no two bodies within our solar system which are classified as planets are considered double.
Pluto is not a planet its a dwarf planet
Within our own solar system, some view Pluto as being a double planet with it's moon Charon (which is half it's size).