Quoted By:
Since Lucario seems to be named after the mythical metal orichalcon (ru·ka·ri·o from o·ri·ka·ru·co·n) I would simply name its Mega "Ricalucon"/"Ricalcon", like just "orichalcon" but without "o" to convey the feeling of being even closer to the metal, but also because "o" is japanese for "ruler", "king", "lord", "sovereign", etc, so the true "orichalcon" would be "lord Ricalcon", only difference with the real metal would be the extended "o" sound ("ōrikarucon", not "orikarucon")
