Mercury is the 'speediest' planet because of it's fast rotational speeds.
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Mercury's nickname is "The Swift Planet" due to its fast orbital speed around the Sun, making it the speediest planet in our solar system.
Pluto is the planet that scientist are saying is not a planet. Scientists are not saying any particular planet is not a planet. Simply that Pluto has been reclassified as a dwarf planet.
No, Venus is not a dwarf planet. It is considered a terrestrial planet and is the second planet from the Sun in our solar system.
Planet X was a hypothetical planet which was searched for after the discovery of planet Neptune. `Planet-X` does not exist.
Pulto is a hypothetical planet sometimes referred to in science fiction or urban legends, but it is not officially recognized as a planet or dwarf planet by the scientific community.