Bro, if its Specs, it can,t be booster SpA. You would need to use Pincurchin + the Sun setter (Sun setter = bad Mon, Pincurchin = Another bad Mon, so you have to use 2 bad Mons).
I have actually tried doing this like a year ago, but it didn,t work too well: https://pokepast.es/e6991c9be020e9a9