>>39686067There is almost never enough EXP to get a team of 6 with levels high enough to take 2 hits or be faster and take 1 even. Meaning you need to go grind 6 random pokemon that aren't all that good and you will dump because they evolve into trashmons.
Fundamentally at this point it is often more efficient to invest all the EXP into 1-2 pokemon you are more committed to as any time grinding will also be going to towards future gyms.