There is no code. There are underground tunnel tickets in the trash can near the tour. Open the trash can that is open and search the trash. You'll find them. Give them to the guy in the Web Browser Internet Cafe. He'll give you one. Then, you can go on the tour.
in the trash can next to the tour entrance then bring it to the guy in the Internet Cafe.
a guy selling them gives them to you for free.You should see when you first come in.He's standing by a trash can.
becuz she wants 2
From inside the tabloid that the guy in the grocery store drops when you talk to him.
Go all around Big Nate's Island for slips of paper and talk to the guy in the comic store for the headline then go to items and select comic and assemble the comic and it will reveal the code for the locker.
the code is orange then purple then blue then blue
Bin man/ Trash...guy
first, you have to jump in the fountain(top water part) and you will get the gold coin. then bring it to the museum and give it to the guy. then go to the seconed floor of it and clik on the books that are staked on top of each other. then, the guy will say that the books can not move from that spot and will give you a piece of paper that has the library pass, then go to the library's bottom floor and click on the gold sign that says mcm or something like that then the floor will open.
you can get a riolu egg in Pokemon diamond/pearl on Iron Island by helping a guy named Riley out
You go next to the tunnel, and the you click on the second trashcan to start looking in it to find two tickets. After you find them, return them to the guy in the coffee shop. He will give you one of them.
umm if u go over to the trash can and if u dig in there ull find the tickets but then u have to take them to the guy at the cafe and then he gives u one ticket:)