It depends on the lucarios personality.Go to the lucarios summary, then you go to the second tab.At the bottom it will tell you what poffins it likes
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It all depends on it's nature, with each nature comes a different taste in poffins. You can find these natures and what they like in the Bulbapedia.
Go through the summary of your buneary and it will say what flavors of food it likes. Make the type of poffins based on that.
It really depends on the Chansey's nature/what type of contest you want to have it in. Try serebii.net to find what natures like what poffins and what poffins improve which contest. I use it and it works well :D
They are from the canine family, they growl alot like dogs do. Pokemon Master & Lucario Biologist ~Bolt the lucario
Super Poffins in Poffin CasePress L+R to activate.94000130 FCFF0000B21C4D28 00000000B0000004 00000000E00052BC 0000031063636319 0063636363636319 00636363I DID NOT MAKE THIS CHEATWarning: This cheat will toss all Poffins that you have and give you 2 Rich Poffins. It takes 3 Rich Poffins to get max stats for one Pokemon so use the two poffins that it gives you, then close the Poffin Case, then press L + R. Open the Poffin Case and you will have two more Rich Poffins. Do this as many times as you like!