First, you must have activated the ledge that is brought up by the correct order of the switches. Also, be sure to have the rose garden key. Use a sun card if it is not morning out, then go to the rose garden and you should see a red rose in the center area with white roses, press the grab button and you will recieve the Thorn key. Take the key to maze garden, and go to the locked fence. Open it and get the rose. Once you have the rose, be sure to take it the top of the water fountain, and place it in there. You will then obtain the half crest A.