It Eliminates Frustrating Randomness

Right now, in order to level up pokemon go account specific Pokémon, you have to rely entirely on luck. Luck either being finding spawn nests of rare Pokémon near where you live/work, or luck being the “egg lottery” where you walk around hatching eggs in the hope that you get a Pokémon you’re looking for. With evolutions costing anywhere between 50 and 100 candy, usually, you often need to catch/hatch a dozen or two of the same rare Pokémon, which can often feel impossible.

Now, with the Buddy system, you can specifically choose which Pokémon you want to train, and get candy that way. It will probably be a pretty slow process, but for example, if you started with a Charmander and have yet to see another one in the wild or in eggs, you can put in the work and eventually get the 125 candy you’ll need to evolve it into a Charizard. Or, for other Pokémon where you’ve been crawling to try buy rare pokemon and reach their final stage evolution for months (in my case, Golem, Alakazam, Primeape), you can get that final stage by grinding out just that 10-20 missing candy you need, rather than waiting weeks to hatch/find 3-5 more of them. Obviously the ideal way to train Pokémon would be to battle them in gyms, but this is the next best thing.