Elemental XA * YA

No Parameters 

Returns r2 = 0x00 if Attacks Hits
        r2 = 0x01 if Attack is nullified because of elements

Handles Elemental Damage modification (Weakness / Resistance / Nullification / Absorption / Weather)
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0018877c: 27bdffe8 addiu r29,r29,-0x0018    
00188780: afbf0010 sw r31,0x0010(r29)       
00188784: 0c06195a jal 0x00186568           |-->XA * YA Calculation Multiply Ability XA and YA and store the result as HP damage
00188788: 00000000 nop                      |
0018878c: 0c061bb4 jal 0x00186ed0           |-->Weather Elemental effects  +25% HP damage For Thunder and Ice or -25% damage For Fire according to the weather
00188790: 00000000 nop                      |
00188794: 0c061bfe jal 0x00186ff8           |-->Ability Elemental?  Checks For Target Elemental resistance/Weakness - Deals with [Oil + Fire]  and [Float + Earth]
00188798: 00000000 nop                      |
0018879c: 3c028019 lui r2,0x8019            |
001887a0: 8c422d90 lw r2,0x2d90(r2)         |r2 = Target Current Action (TCA) data pointer
001887a4: 00000000 nop                      |
001887a8: 90420000 lbu r2,0x0000(r2)        |r2 = TCA Hit flag (set to 0x00 if Attack is nullified because of elements)
001887ac: 00000000 nop                      |
001887b0: 2c420001 sltiu r2,r2,0x0001       |r2 = 0x01 if Attacks misses, 0x00 if Attack hits
001887b4: 8fbf0010 lw r31,0x0010(r29)       END
001887b8: 27bd0018 addiu r29,r29,0x0018     
001887bc: 03e00008 jr r31                   
001887c0: 00000000 nop                      

Returns locations

Battle.bin
00188984: Truth/Formula_5E-5F_Magical_damage
00188c74: Formula 04 : Magic Gun
00188dbc: Formula 08 : 08 Dmg F(MA*Y)
0018949c: Formula 1f : Dmg ((100-CasF)*(100-TarF)*(MA+Y)*MA/2)