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You could try checking out rental teams online. VictoryRoadvgc and TrainerTower appear to have a collection of teams. They have a code that you can put in (I'm assuming somewhere in the Battle Tower) and you get to use the team in the Tower and Online.
If you want to construct a team on your own, you may want to head to the Competitive Pokemon subforum for some advice.
You can build a team around Whimsicott and Alcremie they are pretty cute if you ask me. Then just have some ugly tough rough Pokemon to back them up lol.