December CD
Time to bet.
Answers
Not likely, yes slaking has great stats, but the same jobs a hypothetical generalist slaking could do other generalists can do better and more, look at MM metagross, third best over all behind only rayquaza and shadow ball mewtwo
Slaking was never really monsterous to begin with it goes down pretty fast as a defender and as an attacker its best move is play rough or hyperbeam (and we all know how we feel about that move). A lot like a hypothetical fairy fast move gardevoir or even fairy wind togekiss, it wouldn't improve slaking's standing in the game beyond novelty unless the move it got was massively overtuned (and even then slaking would lack either type effectiveness or STAB)
But part of me does hope its slakoth because where I live we get a lot of snow