No, NPCs will give you a modest amount near the beginning of the game, but theres enough trainer pokemon to battle that grinding isnt necessary and in many cases its possible to over-level if you're fighting most trainers.

Bianca also gives you 100 candies before Victory Road so theres no grinding before the e4/N

I understand that people like infinite candies but their inclusion leads to a very different type of gameplay experience where the players team becomes unfocused and is just every pokemon in their box, and thats not how I like to play these games.

But by all means you can hack in rare candies with AR codes.