As this arc is anime-original (filler), there is no direct equivalent in the original manga's Chapter 147, which instead covers the Nirvana arc ( Fairy Tail Wiki ).
A significant portion of the episode involves a raw showdown between Gildarts and Byro, showcasing a rare battle that doesn't rely solely on magical firepower ( Crunchyroll ). Context within the Series Fairy Tail Episode 147
The Fairy Tail mages split up to engage different members of the Oración Seis and the Legion fighters. Notable matchups starting or continuing include Natsu’s race toward the Infinity Castle and the guild members dealing with adversaries like Byro and the remaining Six. As this arc is anime-original (filler), there is
Happy deduces a different solution: the Infinity Clock will stop if the Reborn Oración Seis are completely defeated. This shifts the focus from protection to an all-out offensive. Following the defeat of Cardinal Lapointe, it is
Following the defeat of Cardinal Lapointe, it is revealed that the only way to supposedly stop the Infinity Clock is the death of Lucy Heartfilia. This creates immediate tension as the Legion Corps believes killing her is a necessary evil to save the world.
Do not confuse this with Chapter 147 of the sequel manga, Fairy Tail: 100 Years Quest , where Team Natsu faces off against a powerful weaponized android known as Athena II ( Fairy Tail Wiki ).