Do you hate Rosalina? So much that you're willing to spend a ton of money to buy as many as you can to keep her off the market? Well, to prevent too many people from having her, you might want to import her Japanese counterpart as well, "Rosetta & Chiko".
You can try your luck importing it, or even travel to Japan to buy them in person. Either way, you can rest in the knowledge that you're keeping this horrid character out of the hands of those that really like her.