I just rode back and forth on my bike in Castelia City until it liked me. It was a surprisingly fast method, seeing as in early gens that never seemed to work.
i am fairly sure that won't work
It does, albeit very slowly.
Levelling provides large boosts to it, as does feeding it vitamins, but walking is always on hand and you don't need to worry about overlevelling and missing a move. --- Bullet Hell fan, Cave and Touhou lover. <3 Patchouli Knowledge. Playing: DeathSmiles, Fire Emblem 8, Rune Factory 3, Digimon World Dawn, Tales of Vesperia