Well, technically, Void doesn't have the ability to summon TRUE black holes. He (and the other kids) all have a version of dark chaos energy, a byproduct of trying to reach the Perfected Ultimate Lifeform through Project Stellar. The main concept was trying to build upon Gerald Robotnik's research, attempting to create a living soldier that could harness latent chaos energy on a whim in order to artificially go super.
Void, essentially, is capable of creating dark chaos energy with such incredible mass that it effectively acts like a black hole. He basically figured out how to use the power of chaos control (the thing that allows Shadow and all of his lab kids to teleport) in reverse, compounding upon matter instead of transferring it from place to place. It effectively allows him to rip stuff apart instead of just moving it around.
Anyway, Polarity DOES have his own chaos abilities, but they are far weaker than his siblings. He usually uses them for run and gun tactics, utilizing his super speed to get in, and then his chaos spears to do damage. He tends not to rely on the teleportation abilities that Void and Andromeda do, seeing as he's fast enough to not really need them. That, and he has a far smaller chaos energy reserve, and if he isn't careful he can burn himself out by using too much of it.
Despite his weakness, I would say Polarity is probably the most technically skilled out of his siblings. He has always known he was at a power disadvantage, so he trains far harder than anyone else. His skill in combat is undeniable, even if he is seen as a failure by both the researchers that created him and his older brother.
As an additional add-on, I don't know if I ever mentioned it, but Void doesn't have super speed at all. He entirely relies on his massive power and incredible physical strength. He also has the most Black Arms DNA, which is why he is larger than both Sonic and Shadow, along with his trio of siblings.
