With the move punishment the formula for damage is 60+20x x (x being # of stat boosts). If you lower the other Pokemon stats would it lower damage?
No.
For instance, if the target had 1 Swords Dance boost and 2 Calm Mind boosts, then this would be +2 Attack, +2 Special Attack, and +2 Special Defense, so Punishment's power on it would be 60 + (20 * 6) = 180. This move's maximum power is 200. Also, stat drops do not affect the Base Power.
http://www.smogon.com/bw/moves/punishment
