Apparently the current super sentai series in japan is pirate themed: http://en.wikipedia.org/wiki/Kaizoku_Sentai_Gokaiger
One episode of which has them teaming up with the ninja rangers: http://orendsrange.blogspot.com/2011/08/kaizoku-sentai-gokaiger-vs-hurricanger.html , http://powerrangers.wikia.com/wiki/Pirates_and_Ninjas


Apparently the rangers in this series have access to the powers of all rangers from previous series.

Oh

The beginning of this episode shows a battle scene with pirates & ninjas united: http://www.dailymotion.com/swf/video/xkvnju_kaizoku-sentai-gokaiger-episode-28-eng-sub_shortfilms