Try searching 'download shoddy battle' on google. It's not hard to find. But, since I'm nice, I'll give you a link. This
is the page where you download shoddy. In the upper left hand corner of the page, there is an open box with a yellow arrow pointing down into it. Next to that box is a link that says 'Download.' Just click that, and click save I believe, and you have downloaded shoddy. It's not a very big file by the way. I don't know the exact size, but I know it's small.
And to make a team, once you are logged in, (you must first register) in the upper left corner of the shoddy page, it says 'team builder.' You click that, and a drop down list will appear. Click 'New Team.' In the window that comes up, there are six slots, each are a bulbasaur at first. You can make them any pokemon you want, and you can click what moves you want them to know, give them any item, any nature, any set of IVs you want. If you have done competitive battling, you shouldn't need any instruction on how to make them. And when you are done, just save it like a Word Document. And you can make changes to the team when you want to, by opening the file.
If you have any more questions, just ask.