The Waddle eShop is a pre-installed app on the Waddle Omega. With it you can download many games such as Kirby Tennis, Mining Quest, Pikmin 2 and more.
This image shows Kirby Tennis in the Games on Sale category. As you can see there is not much games on sale. This is due to the fact that not many original Waddle Omega games have been released. There is also a note below the price saying that it is on sale. You can see what category you are in by looking at the banner near the bottom of the screen.
This image shows Kirby 64: The Crystal Shards in the Virtual Console category. The Waddle Omega doesn't have much virtual console games, because it is still in development.