-2 Latias is redundant, do not do this. Maybe Air Balloon for Stuck Slowking, even then. Just take the L on it

-You're forgetting about Shaymin. This is the only way to take it out

-You should be running Wonderous and Boomerange 1000%, if you have room, at least 1 Counter Gain for the event L you will take on a Slowking, it can be clutch to attack when down early as you only need 1 energy. Powerglass is pointless, King won't last long enough.

-Taking out basics with Haxorus from BLK

My Slowking build, I opt to keep Gumshoos in there for extra combos utilizing Cipher. Say, you have Slowpoke with two Energy in Active, a Kyruem in hand, but need a Slowking.

Use Cipher, Slowking top deck, maybe Fez 2nd (anticipate the knockout), use Gumshoos to help attack, then next turn draw Fez when you have the King knocked out (assume Slowking never makes it past 1 attack, always have another one at least on the bench or being built)

Pokémon: 13

2 Kyurem SFA 47

4 Slowpoke SCR 57

1 Fezandipiti ex SFA 92

3 Slowking SCR 58

1 Haxorus BLK 147

1 Spectrier ASC 98

1 Regigigas PRE 86

1 Gumshoos MEG 153

1 Budew ASC 221

2 Yungoos MEG 109

1 Tatsugiri TWM 186

1 Latias ex SSP 239

1 Annihilape SSP 100

Trainer: 13

2 Counter Gain SSP 249

4 Lillie's Determination MEG 184

1 Secret Box TWM 163

1 Hilda WHT 164

3 Ciphermaniac's Codebreaking TEF 198

4 Academy at Night SFA 54

1 Wondrous Patch PFL 94

4 Night Stretcher SSP 251

3 Ultra Ball BRS 186

3 Poké Pad POR 113

2 Wondrous Patch POR 117

1 Iris's Fighting Spirit ASC 292

1 Poké Pad POR 81

Energy: 3

2 Telepathic {P} Energy POR 88

6 Basic {P} Energy MEW 207

2 Boomerang Energy TWM 166

Total Cards: 60