Do you want to know what level chests are in your grotto? Do you want a way to farm those chests for alchemy ingredients or some sought after item? Here's how:
Note: Before I begin, I should mention a few things. Once you get the hang of this, it isn't as difficult as my long instructions may indicate, but it is not trivial, so you may find that it is not worth your while or that you don't enjoy exploiting the game to this degree. Also, I did not discover any of this information or make any of these tools. I'm only passing the information along since, to my knowledge, it hasn't been collated into one complete set of instructions.
Oh, one more note, I haven't tested these sites very much, so I have no idea how extensive the grotto databases are. Your grotto may or may not be in the database.
1) To determine what chests are in your grotto:
First, go to this website:
http://dq9.ffsky.cn/maplocation.htm
and determine the location of your grotto. Make a note of the alpha-numeric value assigned to your grotto. For example, if my grotto was just south-east of Angel Falls, it would be 01. Now, go to this website:
http://www20.atpages.jp/dq9tools/tmape.cgi
Enter all of the information pertaining to the name of your grotto. In the last pull down menu, enter the location of your grotto that you noted above. Press the button. More information about your grotto will be displayed including the Boss, the starting rank of the monsters, how many floors it has and how many S, A and B rank chests it contains. Pay special attention to the text before the 'MAP' link (it should be something like '6926-L', but the specific numbers and letters will be different based on your grotto). You will need this information in the next step. Click on the 'MAP' link. This will show you where every treasure chest in your grotto is and what rank it is (in order to view the map properly, you need to change the encoding to Japanese (Shift-JIS)).
2) To determine the time table of your chests:
Go to this website:
http://www20.atpages.jp/dq9tools/from_site.html
Enter the code you found on the previous site (e.g. 6926-L) into the box (If you are still confused about the location of this code, this website provides sample screen shots above the text box). Click the button. You should see a long table. Below the table are two drop-down menus. In the first menu select the option that has 'PC' in it and press the button. You should be directed to a new page. On this new page click on the first link (amongst the Japanese text should be the level of your grotto). You should now see a table that lists every chest in the dungeon and the timing for every item that can be found in each chest. The one issue is that every item is in Japanese. As a reference, you can visit this site:
http://dq9.org/dq9_takara2.html
By toggling between the Google translation, you should be able to find the Japanese name of the item you are looking for without too much difficulty.
3) Making use of the time table:
Let's say that you've found the item you are looking for and the table says that it spawns at 23 seconds. How do you open the chest at 23 seconds? First you are going to need a stopwatch. I've been using this:
http://www.online-stopwatch.com/. Then, you need to enter your grotto and go down to the location of the chest that contains your desired item. Quick Save. When you restart your game you will get the quicksave message. When you select "Load quick save data" start the stopwatch at the exact same time. As your game loads, press the b button to get past the grotto text and immediately press select to enter Stella's screen. Stay on this screen until the timer reaches the desired value (23 seconds, in our example). Then press b to cancel out of the screen and open the chest. If all went well, you should now possess that great item or alchemy ingredient.