Check if Unit can be Targeted (Cryst/Trea/Mount/Trans)

BATTLE.BIN : Check if Unit can be Targeted (Cryst/Trea/Mount/Trans)
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Parameters - r4 : Unit ID

Returns r2 = 0x00 if Unit can be hitted/targeted
        r2 = 0x01 if Unit can't be targeted (Crystal, Treasure, Ridden, Enemy Transparent)

Note : There is a weird control of transparent unit riding a transparent unit.
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00196ce8: 3c06801a lui r6,0x801a            |
00196cec: 24c6f3c4 addiu r6,r6,0xf3c4       |r6 = AI Data Pointer
00196cf0: 000410c0 sll r2,r4,0x03           |ID * 8
00196cf4: 00441023 subu r2,r2,r4            |ID * 7
00196cf8: 00021180 sll r2,r2,0x06           |Unit ID * 0x1c0
00196cfc: 3c038019 lui r3,0x8019            |
00196d00: 246308cc addiu r3,r3,0x08cc       |
00196d04: 00432821 addu r5,r2,r3            |r5 = Unit's Data Pointer
00196d08: 90a30001 lbu r3,0x0001(r5)        |Load Unit's ID
00196d0c: 340200ff ori r2,r0,0x00ff         |
00196d10: 10620025 beq r3,r2,0x00196da8     #If Unit doesn't exists :  Returns r2 = 0x01
00196d14: 34020001 ori r2,r0,0x0001         |
00196d18: 94a20058 lhu r2,0x0058(r5)        |Load Current Statuses 1+2
00196d1c: 00000000 nop                      |
00196d20: 30420140 andi r2,r2,0x0140        |Check [Crystal] and [Treasure]
00196d24: 14400020 bne r2,r0,0x00196da8     #If Unit is Crystal or Treasure: Returns r2 = 0x01
00196d28: 34020001 ori r2,r0,0x0001         |
00196d2c: 90a30182 lbu r3,0x0182(r5)        |Load Unit's Mount Info
00196d30: 00000000 nop                      |
00196d34: 30620040 andi r2,r3,0x0040        |Check [Being Ridden]
00196d38: 1440001b bne r2,r0,0x00196da8     #If Unit is a mount : Returns r2 = 0x01
00196d3c: 34020001 ori r2,r0,0x0001         |
00196d40: 00041100 sll r2,r4,0x04           |Unit ID * 16
00196d44: 00461021 addu r2,r2,r6            |8019f3c4 + Unit Offset
00196d48: 90421834 lbu r2,0x1834(r2)        |Load Enemy flag  8019f3c4 + 0x182c + 0x08 + Unit offset
00196d4c: 00000000 nop                      |
00196d50: 10400015 beq r2,r0,0x00196da8     #If This Unit has the enemy flag /Else : Returns r2 = 0x00
00196d54: 00001021 addu r2,r0,r0                |
00196d58: 90a2005a lbu r2,0x005a(r5)            |Load Current Statuses 3
00196d5c: 00000000 nop                          |
00196d60: 30420010 andi r2,r2,0x0010            |Check [Transparent]
00196d64: 1040000f beq r2,r0,0x00196da4         #If Unit is transparent : /Else : Returns r2 = 0x00
00196d68: 30620080 andi r2,r3,0x0080                |Check [Is riding]
00196d6c: 1040000b beq r2,r0,0x00196d9c             #If Unit is riding /Else : Returns r2 = 0x01
00196d70: 3062000f andi r2,r3,0x000f                    |r2 = Mount ID
00196d74: 000218c0 sll r3,r2,0x03                       |
00196d78: 00621823 subu r3,r3,r2                        |
00196d7c: 00031980 sll r3,r3,0x06                       |Mount ID * 0x1c0
00196d80: 3c018019 lui r1,0x8019                        |
00196d84: 00230821 addu r1,r1,r3                        |Part of mount data pointer
00196d88: 90220926 lbu r2,0x0926(r1)                    |Load Mount's Current Statuses 3
00196d8c: 00000000 nop                                  |
00196d90: 30420010 andi r2,r2,0x0010                    |Check [Transparent]
00196d94: 14400004 bne r2,r0,0x00196da8                 #If Mount is Transparent Returns r2 = 0x00 ?? Why ? 
00196d98: 00001021 addu r2,r0,r0                            |r2 = 0 (Success)
00196d9c: 08065b6a j 0x00196da8                     #E      |>>Returns 0x01
00196da0: 34020001 ori r2,r0,0x0001                         |
                                                #Else : Not transparent Unit
00196da4: 00001021 addu r2,r0,r0                |r2 = 0 (Success)
00196da8: 03e00008 jr r31                   END
00196dac: 00000000 nop

Notes

Emmy on line 00196d94 :  Is this supposed to be a beq? Makes more sense for both being invisible failing* 

If a unit is transparent, the routine checks the ridding byte :
  - If riding a transparent mount --> Returns 0x00 (success ??)
  - If riding a non transparent mount --> returns 0x01 (fail)

Return Locations

BATTLE.BIN
0019436c: Set_type_of_target_for_all_targets
001991b8: Calculate_Physical?_Target
0019deb4: AI_ability_processing