Uhh.. What are you asking? Are you trying to decide which attack will do more damage?

Damage = ((Level x 2 + 10)/250 x (Atk stat / Def stat) x damage + 2) x modifier

Modifier = STAB x Effectiveness x critical x held items x weather x ability (a random number between .85 and 1)

Now we don't need Blazikens Base Stat at all when calculating for damage, we need the actual Stat.

So let's assume your Blaziken is level 100 and has maximum Attack and Special Attack for simplicities sake.

Blaziken lvl 100

Atk: 372

SpA: 350

And you're battling a Pokemon whose Defense and Special Defense is 262.

Blaze Kick:

D = ((level x 2 + 10)/250 x (Atk/Def) x BaseDamage +2) x multiplier

D = ((100 x 2 +10)/250 x (350/262) x 85 + 2) x M

D = ((210)/250 x (1.34) x 85 +2) x M

D = ((.84) x (113.9) + 2) x M

D = 97.676 x M

M = 1.5 x 1 x 1 x 1.1 x 1 x 1.5(blaze) x 1(random simplicity)

M = 1.5 x (1.1 OR 1.5) x 1.5

M = 2.475(charcoal) or 3.375(Choice Specs)

D = 97.676 x (2.475 OR 3.375)

D = 241.74, 329.657

Did you get that?

Sky Uppercut:

D = ((100 x 2 +10)/250 x (372/262) x 85 + 2) x M

D = ((.84) x (120.68) + 2) x M

D = 103.37 x M

M = 2.475 (fighting type held item) or 3.375(Choice Band)

D = 255.86, 348.90

Is that what you were looking for? All I've done is calculated the total Hp lost by these attacks.