The wireless adapter is an accessory you can buy at any game store like game stop its not in the emerald game its a real life item.
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The Wireless Adaptor is only compatible with Pokemon FireRed, LeafGreen, and Emerald. It allows you to enter the Union Room and connect to another game that also has a Wireless Adaptor without a Link Cable.
The way you get waterfall is by trading the waterfall HM from Fire Red Version or the other Version that have waterfall HM ( you can trade with a link cable or wireless adaptor)
You only need that when your Xbox isn't Wireless built in or you don't have router.
you need a special adaptor
No, you cant get on the internet if you dont have it.