One Type Limit

[Ashje]

Let's say that I'm making a Pokemon Adoptables site and I want the user to be able to choose one starter and one starter only and not to be allowed to adopt the others after they have adopted one. How would I go about doing that?

In more generic terms;

Let's say I have 12 adoptables on a page and I want the user to only be able to adopt one out of those 12. After that, if they try adopting another, they get an error. How would I do that?

Thanks,
Ashje.