Step 1: Recall oxidation states of transition elements.
Transition elements show variable oxidation states due to the involvement of both \((n-1)d\) and \(ns\) electrons. Step 2: Identify the maximum oxidation state.
Elements like osmium and ruthenium exhibit the highest oxidation state of \(+8\). Step 3: Conclusion.
Therefore, the highest oxidation state exhibited by any transition element is \(+8\).