This was the description on the YouTube video:
This is a fandub of the champion battle from Pokémon Origins. Since the official music doesn’t come out ’til the 13th. I used the Black 2/White 2 version of the Champion Battle, and created custom remixes based on the FireRed versions of the other two tracks. Since we had to replace the music, we had to re-do the Pokémon voices as well (except for two spots where Charizard and Blastoise got to keep their voices since it was music less there). This was a fun dub to do!
DBZ Sound Effects come to save the day!
Sakasa Jin’ei: Red, Jolteon, Pidgeot, Dodrio, and Persian.
El Diabeetus: Green, Prof. Oak, Rhydon, Scyther, Arcanine, Charizard and Blastoise.