So I followed the guide up to the shopping list in Celadon city, and the item flow list is inconsistent with the shopping list. Can someone give me detailed instructions of what to do from here? I did a safety save in front of Celadon Dept. Store because this is my first run. Thank you in advance.

Im willing to help you, however im confused on what you are asking. You are stating that after underflowing your items, your items didn't match up with the stream? If that's the question, then that's normal. Some items and amounts will differ, and they don't matter. As long as the items that are switched in the run are there (for example, the masterballs and full heals) then you're good. Amounts of these items will vary as well. Hope that helps.