Newish to TCG, but afaik ASC Spectrier isn't really seeing play in Slowking anymore. From my experience it's a high risk card with a deceptive reward since it requires a full discard and it's mainly used to pick off Shaymin. But decks that run Shaymin also have ways to recycle it in a pinch, which in turn means you have to recycle Spectrier if you still want to Kyurem. Afaik the tech is looking more like (feel free to post corrections if/when i'm wrong lmao)
SSP :annihilape: KOs both active. Can't be used recklessly but very helpful for getting past high HP mons not named Mega Luke or Pult (Cynthia Chomp, Shark, Starmie, Exca) and recyclable unlike Bangle. The catch is that it can't take out Mega Lopunny with Mist Energy which Bangle can
PBL :annihilape: Deals 100 and puts 5 damage counters on a benched Pokemon. A less committal way to pressure Shaymin if you want while also allowing you to pick off low HP Pokemon, namely Abra and Duskull if your opponent is on Zam
:munkidori: There's a spicy Slowking variant that swaps out Secret Box for Prime Catcher and runs Munkidori and a Crispin engine. This not only lets you hit nice KO thresholds, but also means Annihilape -> Munki takes out Shaymin on your own turn and lets you Kyurem without care
:cofagrigus: Cof puts 6 damage counters on all Pokemon with an ability. Risky, but obviously crazy against Zam and gives you damage counters for Munki (and also sets up a Shaymin KO)
:drapion: and :pawmot: Both paralyze the foe while damaging you; Drapion deals 100 and poisons but does 70 to you, while Pawmot does 130 and the Para is an optional effect that does 60 to you. There's a fair number of decks in the format that can't switch out easily which this can come in clutch against, but it also makes Munki plays easier; granted, I feel like a lot of the B tier decks have an out to this card. Pawmot is probably better in general (Drapion's 70 puts Slowking in range for a Dusclops KO) but the poison gives Drapion some nice applications, especially in the mirror (since if you hit an opposing with Drapion they'll get KOed at the start of your turn, which is a huge tempo swing)
30th :unown: Deals 40 but lets you take an extra prize if it KOs, good for weakened Pokemon and punishing Budew (albeit Lucky Helmet does this too). Also combos well with Drapion and Pawmot.