Original: Lucario is a PokÃ mon that appears in the Nintendo DS versions of PokÃ mon Diamond and Pearl ; The only way to obtain it is to get a Riolu egg from Riley on Iron Island , hatch the egg , and evolve Riolu . Lucario is used by Maylene , the third Sinnoh Gym Leader , a tag-team partner known as Riley , and by Cynthia , Sinnoh 's Elite Four Champion .
Simplified: Lucario is a PokÃ mon that appears in the Nintendo DS versions of PokÃ mon Diamond and Pearl ; Lucario is used by Maylene , the third Sinnoh Gym Leader , a tag-team partner known as Riley , and by Cynthia , Sinnoh 's Elite Four Champion .