A Pinkanbar is a candy product that, as the package states, is 'made from real Pinkan Berries!' The bar is sweet tasting and can help recover energy expended by pokemon, fusions and humans through battle or other such things.
The Pinkan Berry is an interesting berry from Pinkan Island. It has the result of turning a pokemon or fusion who consumes it pink within a few minutes. The Pinkanbar has the same effect when consumed. If no more of them are eaten, the effect will wear off in a couple of days. However, continual consumption will make the effect perminant.
Although all of these facts are stated on the wrapper, people have been known to eat them without paying attention. Currently, Eve is the marketing face behind the Pinkanbar, and has helped the bar grow in popularity.