Jessica's Greer is a very old Lucario, very much at the end of his life span; he is the father of Quint and the adopted father of Jessica's Lopunny. He opted to join Jessica after he discovered she had caught his daughter, bringing Quint with him and noting that he feared he would no longer be able to take care of himself soon enough. While he is oft remembered as a very strong Pokemon that handled his old age in stride, all things must come to an end and Greer is no exception. That isn't to say that he can't still fight, but that his body is beginning to fail him and his endurance has taken a very significant hit as a result. For most of his life Greer lived in isolation from humans, Jessica literally being one of the first he met. His ability is Inner Focus.