Based on a generalized particle diagram of baryons and anti-baryons which, in turn, is based on symmetry principles, this theory predicts the existence of: double-flavoured pentaquarks and double-flavoured mesobaryonic particles, triple-flavoured pentaquarks and triple-flavoured mesobaryonic particles, quadruple-flavoured pentaquarks and quadruple-flavoured mesobaryonic particles, quintuple-flavoured pentaquarks and quintuple-flavoured mesobaryonic particles, two distict groups of pentaquarks and mesobaryonic particles with zero total strangeness. The theory, of course, also predicts the anti-pentaquarks and anti-mesobaryonic particles corresponding to all predicted particles. More importantly, this theory predicts the existence of the (u u d c ̄c) pentaquark and the existence of the (u u d c ̄c) mesobaryonic molecules. This prediction was confirmed on July 14th, 2015 by CERN researchers with the discovery of two charmonium-pentaquark states with a composition: (u u d c ̄c) with a significance of more than 9 standard deviations. However, there are doubts on whether the discovered particles are pentaquarks - a strongly bound state of five quarks - or mesobaryonic molecules – a weakly bound state of a baryon, (u u d) , and a meson, (c̄c) -. Finally, two remarkable aspects of this theory are: firstly, it predicts the existence of all the pentaquarks and mesobaryonic particles that exist in nature, and, secondly, it predicts the existence of hexaquarks and dibaryon molecules. However, since this theory is about pentaquarks, only two points containing hexaquarks are analysed as an example of the intrinsic predicting power of the formulation.