No,You can't.There is even no Riolu in Emerald and even to all 3 first Generations (Yes,including the Emerald.)Riolu and Lucario only appears at Generation 4 and above Pokemon games.
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Lucario as well as other 4th generation Pokemon were not created in any generation Pokemon game before it meaning they don't exist in Pokemon emerald or anything before Pokemon emerald.
You can't lucario didn't exist until diamond, pearl, platinum came out which came after emerald.
Lucario cannot be obtained in Pokemon Emerald, as it was not introduced until Pokemon Diamond, Pearl, and Platinum, which were released after Emerald.You can only get Lucario in 4th generation games such as Pokemon Diamond, Pokemon Pearl, and Pokemon Platinum.but it's cry sounds like it's from the 3rd generation
Lucario isn't in Sapphire,Sapphire is a Hoenn pokemon,Lucario is a sinnoh pokemon.
Lucario is a fighting and steel type Pokemon.