There are currently two Pokémon in the game that can use the Kings Rock item to evolve. These Pokémon are Slowpoke and Poliwhirl.
To evolve Slowpoke, you can use the Kings Rock along with 50 Slowpoke Candy. This will allow Slowpoke to evolve into Slowking, a Water/Psychic type Pokémon. Alternatively, you can use just the Slowpoke Candy to evolve Slowpoke into Slowbro, a Water/Psychic type Pokémon as well.
The same goes for Poliwhirl. By using the Kings Rock and 100 Politwag Candy, Poliwhirl can evolve into Politoed, a Water type Pokémon. However, if you don’t have a Kings Rock, you can still evolve Poliwhirl into Poliwrath by just using the Poliwag Candy.
The Kings Rock is a unique evolution item that can be quite rare to come across in the game. It is typically obtained as a reward for achieving a seven-day streak on your PokéStop spins, although it can also be received randomly from spinning PokéStops or as a reward for completing Special Research tasks.
When using the Kings Rock to evolve Slowpoke or Poliwhirl, it’s important to note that the evolution is not reversible. Once you have evolved your Pokémon with the Kings Rock, you cannot revert it back to its previous form. Therefore, it’s important to consider which evolution you prefer before using the item.
In my personal experience, I have been fortunate enough to come across a few Kings Rocks during my Pokémon GO journey. I used them to evolve both Slowpoke and Poliwhirl into their respective evolved forms. Slowking and Politoed have proven to be valuable additions to my team, offering unique typings and movesets that have come in handy in battles.
The Kings Rock is a valuable item for trainers looking to evolve their Slowpoke or Poliwhirl into their evolved forms. It adds an extra layer of strategy and excitement to the game as trainers work towards obtaining this rare item and deciding which evolution path to take.