Numbers crawl over the little screen of the keypad. 29. A number to represent the date of your birthday. November ninth. 413. A number to represent Suki's birthday. April Thirteenth. 31. A number to represent Mew Mew's birthday. March first. And finally, 1018. A number to represent the date the monsters were freed from the underground, and you and Syb first met each other in that Dr Monalds play place. October eighteenth.
All these dates portmantua-ed before you on that little screen. You would weep if you knew that was the code. Instead, you just know the code from the back of that photo. It also happens to be a code very similar to the one AD used to open his big vault. Similar in that it's the exact same code used for almost the exact same purpose.
You open the safe.