In the Sinnoh pokedex what Pokemon is number 115 on Pokemon diamond?

Hi! The 115 sinnoh dex Pokemon is Riolu. The pre-evolution of Lucario. You can get a Riolu by going to Canalcave city, saling to iron island, and finding a guy who you have to go with a guy mainly with a lvl 37 Lucario. He will give you a Riolu egg at the end. It will take 6,656 steps for it to hatch. Hoped i helped u. :-)