Somehow I found an ultraball while playing (In the second mission area...somehwere.) and caught a Bellsprout to teach it cut. But hearing that we will get three other partners through events...erm, ya. O.o So first, why was there an ultraball on the ground if we're not supposed to use it? And second, how can I get rid of the bellsprout? xD
Well, The Ultraball was probably a glitch. Without the computers around, you can't get rid of the bellsprout.