What Is the Possible Existence of a Minor Planet?

There are multiple objects in the solar system that have been discovered that have very strange orbits. This can only be caused, or most likely be caused, by the presence of an unknown, massive and large object at a certain distance from the sun. So there seems to be something out there, a massive planet, which is currently very dark, bu which is not visible. May be a planet that is multiple, it times t of the earth from the mass perspective. And let's see what time tells us. It would be interesting. Some people said there could even be a black hole orbiting the sun that we're not aware of. You nowi if it's a black hole, it's