There was plenty more to know about Slowking. In the games, both of Slowpoke's evolved forms, Slowking and Slowbro, were excellent Pokémon.
Slowking already had very high base special bulk. With maximum HP investment and an Assault Vest, it could survive most ordinary super-effective STAB moves. For example, Life Orb Tapu Koko's Thunderbolt did at most 85%, a fully invested Serperior's Leaf Storm only had a chance to take over half its HP, and Choice Specs Hydreigon's Dark Pulse did less than 70%. While it could hardly claim to rival Blissey, that special bulk paired with Regenerator let it pivot into most special attacks without much trouble. Its Psychic typing also meant it did not fear moves such as Psyshock and Secret Sword, making Slowking an excellent option for checking Tapu Lele-even a maximum Special Attack Choice Specs Shadow Ball only had a small chance to take over half its HP. Unfortunately, it lacked Mirror Coat. Otherwise, I would have considered Slowking one of the best users of that move, given how easily it recovered HP.
Assault Vest Slowking could maximize its physical bulk just like Slowbro to become tankier, or it could leave physical attacks to its teammates rather than trying to handle everything itself. The EVs saved could go into Special Attack to boost the damage of its four attacking moves. After all, Slowking had excellent coverage with a four-attack set.
Compared with Slowbro, Slowking also had an advantage of its own in the games. Becoming smarter had allowed it to learn Nasty Plot, making it better suited to setting up its own Trick Room, boosting, and dealing damage. However, Trick Room and Nasty Plot already occupied two move slots, leaving only two attacks and somewhat inadequate coverage. In practice, a slow Calm Mind set without Trick Room