Well itemshop feature is under development for Mys v1.3.0 major release, which is projected to be released in summer. A public battle system, however, is not likely to emerge in the year 2011. You can always hire a coder to make a custom battle system that suits your need though, but it will be quite costly.
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Mysidia Adoptables, a free and ever-improving script for aspiring adoptables/pets site.
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