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.
There are no double planet systems in our solar system. The closest to being considered a double planet are Pluto and its largest moon Charon, but since Charon is significantly smaller than Pluto, it is not classified as a double planet system.
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a dwarf planet, sometimes the Pluto-Charon system was thought of as a double planet, so you can sometimes find that in outdated but authoritative-seeming references.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.
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 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).
That would be Pluto-Charon. While Charon is usually though of as Pluto's largest moon it does not actually orbit Pluto. It is close enough to Pluto's mass that rather than Charon orbiting Pluto, the two objects revolve around their common center of mass, which lies between them, above the surface of Pluto. Keep in mind that Pluto is no longer considered a planet.