Please be specific, don't just give the serebii description.
Stored Power deals variable damage depending on the stat modifications of the user. When the user has no stat modifications, Stored Power's base power is 20. Its power increases by 20 for each stat boost the user has, and does not decrease in power due to stat drops below 0. It reaches a maximum power of 860 [20 (base power) + {20 x 7 (total number of stats that can be maximized, including Evasion and Accuracy) x 6 (maximum number of boosts per stat)}]. http://bulbapedia.bulbagarden.net/wiki/Stored_Power#Effect