I've searched all over and cant seem to find the person selling the moo-moo milk. Where exactly is he/she.... What town, what building?
2 Places sell Moo Moo Milk. 1. Below the Dendemille PokeCenter a Hex Maniac will sell them in Singles and Dozens. 2. In the Lumiose PokeCenter, You can buy Moo Moo Milks with Poke Miles Hope I helped