I've listened through the OST for Gundam Build Fighters Try (ala YouTube), to find this particular song sequence. However, none of the tracks have this bgm, nor seem like an original of the bgm. Does someone know what other bgm track this could be from?
It's in Episode 18, and starts at around 7:25 (Just after Sekai breaks out of an energy net).
Jumped the Gun(dam) here. Show finished Airing 4/2015, and looked for OST around then. OST was released in Dec-2014. However in 2015, a Second OST was released. Found the track: "New Dimension Overlord Flow".
Interesting that the 2nd OST isn't listed on Gundam Wikia.