In FRLG, there are only two such items you get from two different events, both of which have taken place, but one of them is a repeating yearly thing.
You can get the Mystic Ticket, which will take you to Navel Rock where Lugia and Ho-Oh is, and the Aurora Ticket, which will take grant you access to Birth Island where you'll have to solve a little puzzle to get a shot at Deoxys.
And they don't really use e-reader cards to put those items into your game anymore far as I know. They use the Wireless Adapter that came with FRLG to send it to you.