You'll have to reconfigure your router to use WEP, which is not recommended because it's terribly insecure.
Getting a new DS won't help since only DSi aware games support WPA even if the game is in a DSi or 3DS.
Welcome to the forums, Randrews513!
I'm sure you'll get the hang of both the site and the games in time.
Especially since you're a Mystery Dungeon fan .
Moved.
An Action Replay doesn't help you make legal Pokemon, it's up to you to edit the data to be something that could possibly be found in-game.
Example: A Jirachi can't be found on Route 1.
Chips come in sizes of powers of 2. Any data not used is all FF. Most ROM backup tools backup the entire ROM chip instead of trimming data that is probably not used.
Some disk backup tools are smart enough to do this.