Developers Niantic introduced new Pokémon in Pokémon GO for trainers to seek out and attempt to catch. The major new Pokémon in the game are Boldore, Gurdurr, Karrablast, and Shelmet. These are different Pokémon, and knowing where to find them can greatly simplify roaming in your area if you know where to go. You can also evolve these Pokémon through Trade Evolution.
boldore is a Rock-type Pokémon. You can find these types in parts of a city, such as parking lots, streets, and busy cities. You shouldn't have too much trouble finding it on your travels. Boldore is the evolved form of Roggenrola, you can find them in wild eggs and in 5 km.
gurdurr is a Fighting-type Pokémon. Similar to Boldore, you can find it around town, but you want to check around sports stadiums, recreation gyms, and arenas. You want to visit active places where strenuous activities take place. Gurdurr is the evolved form of Timburr. You can find Timburr in 10km Eggs and 1-Star Pokémon Raid Battles.
Karrablast is a Bug-type Pokémon. You can find them on farms, open fields, parks, playgrounds, and in the countryside. If your city has a few parks, check those out, but you may want to venture out of the city to locate them. You can also catch a Karrablast by hatching a 5km egg.
Shelmet it is also a type of bug. Just like Karrablast, you want to study the previously mentioned open areas and you may want to venture out of your city to get the best results in finding it. Again, like Karrablast, you can hatch a 5km egg and potentially get yourself out.
Now, if you want to evolve one of these Pokémon, you can save a lot of candy by doing it through a trade. When you trade this Pokémon with a friend, the cost of the candy decreases, but you cannot receive it again. You can only trade Pokémon Pokémon GO once for another operation. Once they go to them, they can't send it back to you. If you want these Pokémon to have lower candy costs to evolve, you need another trainer to send you theirs.
Boldore becomes Gigalith, Gurdurr becomes Conkeldurr, Karrablast becomes Escavalier, and Shelmet becomes Accelgor. All of these Pokémon are eligible for Trade Evolution, so if a friend is willing to give them your see if you can't find one to trade with them in return. You can secure one for you and make sure your friend has one when they execute the trade.