Thread:~Mana~/@comment-5926375-20130129033018/@comment-3011091-20130130164006

I see, I hadn't noticed that. The majority of content here is based off of the Japanese version, which, looking back at it now, does say Life Destructor.

I did look further into other battles Ryuga was in, and it does seem that Showdown at the Tower of Babel and Nemesis VS L-Drago are the only instances. The rest are Strong Supreme Soaring, and various others. In 4D013, it is refered to as a Special Move, but in 4D044, it's an Ultimate Move.