Go to pokemon rankings and search:
a) if your pokemon lvl is 1-25 search for this level rage: 49-50 (difficulty must at very easy mode)
b) if your pokemon lvl is 26-50 search for this level rage: 74-75 (difficulty must at very easy mode)
c) if your pokemon lvl is 51-100 search for this level rage: 300-350 (difficulty must at very easy mode)
d) if your pokemon lvl is 101-350 search for this level rage: 599-600 (difficulty must at very easy mode)
e) if your pokemon lvl is 351-400 search for this level rage: 999-1000 (difficulty must at very easy mode)
f) if your pokemon lvl is 401 or higher search for at least level 1400 (difficulty must at very easy mode)
And this is it in 2 minutes your pokemon level will pe +100