Get into a double battle have your weak Pokemon GO out with a really strong Pokemon also have your weak Pokemon either hold exp share or lucky egg defeat the trainers and your Pokemon will level up! Even faster way? Have the weak Pokemon your training be traded to you from another game its experience will be boosted and will get lots more exp at the end of battles just as long as you copy the above steps your fine.
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Level 55.
Level 40.
level 16
36
Mankey evolves at level 28.