As of 2014, there is not a listed e-reader code for Pokemon Ruby. There are codes however for other Pokemon versions.
you buy it on eBay.
That's The Eon Ticket. It Trasports You To Southern Island.
Some E-Card tickets are found as Pokemon Trading Cards to play games and such. Others like the ones found in Pokemon Ruby and Sapphire Boxes are for battling a secret person. For example: Pokemon Sapphire=Lady Astrid. You need an E-Card reader for gba to use these cards.
Use a Game Shark or a Action Replay Code.
E reader is a device you can buy its not in the game.
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You will have to trade it from other pokemon.
you have to have a gameshark or action reader or an e-reader to scan it on
E-reader.
Mew is an event only, being in Emerald, Sapphire and Ruby. How to get this mew is by getting the card for it. Back then they had an E-reader. At events for nintendo they would hand out cards for the reader/scanner out to you. Sadly because most people do not have either of these they hack the game for mew. A problem with the E-reader is that you have to have 2 game boys and a link cable. To get the mew event to emerald you have to get mew (the reader gives you a ticket for the ship in lillycove) in Sapphire or Ruby then mix records for the ticket to get to emerald. Then you can do the event as you would in Sapphire or Ruby.
Yes all three of the games could connect to a e-reader.
There is a device you can buy called a E-reader these things have E reader cards these cards and the e reader can be used on your GBA games that correspond to what is on the card you can get different Pokemon in altering cave if you do this.