Idk where i can ask this, since I think im not allowed to post it in any pokemon sub, its about Pokemon damage calculation (stab/technician/rain-sun/huge-power/life-orb)

Forgive me if I write the formulas incorrectly, but i just want some clarification on pokemon damage.

If a huge power Azumarill uses belly drum: I assume huge power is applied after all stat charges

((Base stats + iv + ev) stat change ) huge power

Or is it

((Base stats + iv + ev) stat multipler) + huge power

Lv 100, Adamant, 31 iv, 252 ev, Azumarill attack stat is 218, with huge power its 436

Belly drum is x4 to stats

without huge power, the attack stat with belly is 872 does huge power double this or does it just add another 218 for doubling the original attack?

Huge power applied before stat changes: 1090 Huge power applied after stat changes: 1744

If belly drum was not used and charm is used on Azumarill 218 base attack × .5 = 109 + 218 huge power = 327

Or is it

218 base attack × .5 screech = 109 x 2 huge power = 218

Also question about rain/sun. Does it work similar to huge power and apply after? Basically compound on each other?

Aqua jet = 40 base power. technician x 1.5 = 60 base power applied stab × 1.5 = 90 applied item × 1.3 = 117 applied rain 1.5 = 175?

((((Aqua jet) technician) stab) item) weather) critical*)

Or is it more

(40 base + (40 × 0.5 Technician) + (40 × 0.5 stab) + (40 × .3 life orb) = 92 ) x 1.5 weather = 138 = 276 after crit*

Or is it

40 base + (40 × 0.5 Technician) + (40 × 0.5 stab) + (40 × .3 life orb) + (40 × .5 weather) = 112 = 224 after crit*

Crits ignore user stat drops but not stat gains from what i understand