Monster Skill check prep

#Parameters:
  #r4 = Unit's Data Pointer

#Returns:
  #r2 = 0 if Invalid Unit or no adjacent Unit has Monster Skill
      ≠ 0 if at least one adjacent Unit has Monster Skill

00182430: 27bdffd0 addiu r29,r29,0xffd0            #
00182434: afb00018 sw r16,0x0018(r29)              #
00182438: 00808021 addu r16,r4,r0                  #r16 = Monster's Data Pointer (Acting Unit)
0018243c: afbf002c sw r31,0x002c(r29)              #
00182440: afb40028 sw r20,0x0028(r29)              #
00182444: afb30024 sw r19,0x0024(r29)              #
00182448: afb20020 sw r18,0x0020(r29)              #
0018244c: afb1001c sw r17,0x001c(r29)              #
00182450: 92030001 lbu r3,0x0001(r16)              #r3 = Unit ENTD slot
00182454: 340200ff ori r2,r0,0x00ff                #r2 = 0xFF
00182458: 10620021 beq r3,r2,0x001824e0            #If Unit exists    /Else Branch if Unit doesn't exist
0018245c: 00000000 nop                                 #
00182460: 9205018a lbu r5,0x018a(r16)                  #r5 = Miscellaneous Unit ID
00182464: 0c05f056 jal 0x0017c158                      #Calculate_Height_Data
00182468: 27a40010 addiu r4,r29,0x0010                 #r4 = something off the stack?
0018246c: 92130005 lbu r19,0x0005(r16)                 #r19 = ENTD flags 2
00182470: 92140047 lbu r20,0x0047(r16)                 #r20 = Unit's X Coordinate
00182474: 92110048 lbu r17,0x0048(r16)                 #r17 = Unit's Y Coordinate
00182478: 93b20016 lbu r18,0x0016(r29)                 #r18 = Unit's Support Ability
0018247c: 02602021 addu r4,r19,r0                      #r4  = ENTD flags
00182480: 2685ffff addiu r5,r20,0xffff                 #r5  = X Coordinate - 1
00182484: 02203021 addu r6,r17,r0                      #r6  = Y Coordinate
00182488: 0c060942 jal 0x00182508                      #Monster Skill check
0018248c: 02403821 addu r7,r18,r0                      #r7  = Unit's Support Ability
00182490: 02602021 addu r4,r19,r0                      #r4  = ENTD flags
00182494: 26850001 addiu r5,r20,0x0001                 #r5  = X Coordinate + 1
00182498: 02203021 addu r6,r17,r0                      #r6  = Y Coordinate
0018249c: 02403821 addu r7,r18,r0                      #r7  = Unit's Support Ability
001824a0: 0c060942 jal 0x00182508                      #Monster Skill check
001824a4: 00408021 addu r16,r2,r0                      #r16 = outcome 1
001824a8: 02028021 addu r16,r16,r2                     #r16 = outcome 1 and 2
001824ac: 02602021 addu r4,r19,r0                      #r4  = ENTD flags
001824b0: 02802821 addu r5,r20,r0                      #r5  = X Coordinate
001824b4: 2626ffff addiu r6,r17,0xffff                 #r6  = Y Coordinate - 1
001824b8: 0c060942 jal 0x00182508                      #Monster Skill check
001824bc: 02403821 addu r7,r18,r0                      #r7  = Unit's Support Ability
001824c0: 02028021 addu r16,r16,r2                     #r16 = outcome 1,2, and 3
001824c4: 02602021 addu r4,r19,r0                      #r4  = ENTD flags
001824c8: 02802821 addu r5,r20,r0                      #r5  = X Coordinate
001824cc: 26260001 addiu r6,r17,0x0001                 #r6  = Y Coordinate + 1
001824d0: 0c060942 jal 0x00182508                      #Monster Skill check
001824d4: 02403821 addu r7,r18,r0                      #r7  = Unit's Support Ability
001824d8: 08060939 j 0x001824e4                        #Jump to END
001824dc: 02021021 addu r2,r16,r2                      r2 = all outcomes added together (will be 0 if no adjacent unit has Monster Skill)
001824e0: 00001021 addu r2,r0,r0                   #r2 = 0 (If unit doesn't exist, no beast-master checking required)
001824e4: 8fbf002c lw r31,0x002c(r29)
001824e8: 8fb40028 lw r20,0x0028(r29)
001824ec: 8fb30024 lw r19,0x0024(r29)
001824f0: 8fb20020 lw r18,0x0020(r29)
001824f4: 8fb1001c lw r17,0x001c(r29)
001824f8: 8fb00018 lw r16,0x0018(r29)
001824fc: 27bd0030 addiu r29,r29,0x0030
00182500: 03e00008 jr r31
00182504: 00000000 nop