The Argentinian scored four goals in the last three finals
Barcelona won 3 of the last 5 Cup finals. In 2008/2009, 2011/2012 and 2014/2014... in those three matches, Leo Messi scored at least one goal.
In the first one, in Guardiola's first season at the club, he scored against Athletic Club at Mestalla with a powerful shot.
Three years later, against Athletic Club again, Messi scored the second of Barcelona's three goals.
And finally, last season, Messi enjoyed himself in a double basis: first with a wonderful play getting past four defenders and he closed the scoreline with another one.