You can apply for a new US passport or passport renewal and a US passport card at the same time. This is a convenient option for frequent travelers to have both a valid passport for air travel and a passport card for travel to these destinations by land or sea.
As for when you should use a Seal... use Master Seals on non-promoted classes at level 10 to upgrade them, and Second Seals on non-promoted classes at 10 to switch them over to another class tree (mostly worthless, though switching characters that have access to Mercenary, such as the Avatar, over to it ASAP is generally a good idea), or to switch a promoted class into another promoted class at level 15.
Once you have it, head on over to Slateport, and find the Slateport Harbor. Captain Stern should be inside, and he'll trade you the scanner for one of two items. In Omega Ruby, you'll get the Clear Bell that summons Ho-Oh. In Alpha Sapphire, you'll get the Tidal Bell, which summons Lugia.If you have the Clear Bell, you need to head back to Sea Mauville, and go as far up on the outside of the ship as you can. Once you reach the edge of the deck, you should see a portal.ugia is exclusive to Alpha Sapphire, whereas Ho-Oh can be found in copies of Omega Ruby. Both will be level 50. To capture them, you're going to need to find a scanner. To find the scanner, you need to enter the ship, surf on the water, and then dive down to the deepest level on the ship.