My pokemon games are having trouble selecting the right option

I can’t select the right option when there is a choice option in pokemon Omega Ruby, for example, when you are in the pokemon center and talk to joy, her speech appears asking if you want to heal your pokemon and the options appear ´´ Yes or No. I can’t select the ´´no´´ option because I select the down arrow and it skips the ´´no´´ option for some reason I can’t say. (sorry for grammar mistakes, I’m Brazilian and I don’t speak fluent English). I’m desperate and I hope someone can help me, because there are parts of the game that I can’t pass if I don’t select the right speech.