Fairy Tail Episode 147: To the Infinity Castle!
Episode 147 of 175 of Fairy Tail, aired September 7, 2012, 25 minutes. Available with English subtitles and dub where released.
Episode summary
As Natsu and other Fairy Tail members race to save Lucy before she's sacrificed by the new Oracion Seis, Gildarts has a non-magic showdown with Byro. They also learn the secret of Cardinal Rapowant, that even he didn't know!