How is the atk/def % determined?

[avexus]

Hi, I have a perfect moveset hitmonchan. When I did a nickname, I got:
99% and 78%.
{attack_pct2} and {defense_pct2}

However, from
http://www.pokemongodb.net/2016/05/hitmonchan.html
I got:
Ideal Moveset for Hitmonchan:
Move: Rock Smash Brick Break
Category: Fast Charge
DPS: 10.6 18.8
Rank (DPS): #57 #65
DPS (w/ STAB): 13.3 23.4
Rank (w/ STAB): #23 #39

[julienlavergne]

perfect moveset for attack or for defense ?

[Gobberwart]

No response in 2 days. Closing as this is a question, not an issue and appears to have been abandoned.