Yeah, Free Energy is easy spammable, and it's also the fastest HP move in the whole game, but it has a huge downside, it's the HP attack with less priority in the game, so if you miss your target, or if he's countering you with and HP attack, you're pretty much screwed.
Me, I rather use BRV ---> Meo Twister, since you can combo it even further with Vortex.
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"