I can't find any place to buy HP ups, Irons, and the other things. (I forgot their names)
Where can I get them?
You can buy Vitamins in the Battle Maison (2BP each) or at the Laverre City Pokemart (Right Clerk - 9800 Pokedollars).
You can also find them in trach cans in Lost Hotel, and various routes in the Kalos region.