Hipstercloud

I looked every where and I can't find a pecha berry so i am stuck with nothing else to do but train

i am in need of a pecha berry to progress in the story line of the the game. the ss anne has a pecha berry on it and i have gotten it then i used it when one of my pokemon got posioned and i didnt know the pecha berry was needed to progress now im stuck and cant do anything about it please help