I recently started playing Diamond again, and I sort of came upon this.
The Pokémon won't like or dislike any flavour
Source: Knowledge and Serbeii
Hope I helped!!
Well I did look it up for you and the answer is: That it Dont dislike or like anything here is the like for more hulp :) http://bulbapedia.bulbagarden.net/wiki/Flavor Hope this helps u!