unionall.ssb is a file, containing the game's coroutines. Those coroutines are used to show a cutscenes, return controls to the player after the dialogue with NPC, make a Cutscene -> Overworld transition etc.
You can call those coroutines with CallCommon, JumpCommon, ExecuteCommon and supervision_ExecuteCommon opcodes.
Coroutines
coro END_TALK
coro WAIT_START_FUNC
coro NORMAL_WAIT_END_TALK
coro LIVES_REPLY_NORMAL
coro LIVES_REPLY
coro OBJECT_REPLY_NORMAL
coro LIVES_ACTING_NORMAL
coro ENTER_WAIT_FUNC
coro TALK_UNIT
coro TALK_ADVENTURE
coro TALK_ATTENDANT
coro TALK_PARTNER_MESSAGE
coro LIVES_MOVE_NORMAL
coro LIVES_MOVE_CHANGE
coro LIVES_MOVE_PARTY
coro OBJECT_MOVE_NORMAL
coro OBJECT_MOVE_CHANGE
coro PERFORMER_MOVE_NORMAL
coro PERFORMER_MOVE_CHANGE
coro MOVE_INIT
coro MOVE_PAUSE
coro MOVE_STAY
coro MOVE_SLEEP
coro MOVE_RANDOM
coro MOVE_TYPE1
coro MOVE_TYPE2
coro WAKEUP_FUNC
coro WAKEUP_FUNC_SERIES
coro LOOK_AROUND_FUNC
coro LOOK_AROUND_FUNC_SERIES
coro LOOK_AROUND_DOWN_FUNC
coro LOOK_AROUND_DOWN_FUNC_SERIES
coro LOOK_AROUND_RIGHT_FUNC
coro LOOK_AROUND_RIGHT_FUNC_SERIES
coro LOOK_AROUND_LEFT_FUNC
coro LOOK_AROUND_LEFT_FUNC_SERIES
coro JUMP_HAPPY_FUNC
coro JUMP_HAPPY_FUNC_SERIES
coro JUMP_SURPRISE_FUNC
coro JUMP_SURPRISE_FUNC_SERIES
coro JUMP_ANGRY_FUNC
coro JUMP_ANGRY_FUNC_SERIES
coro LOOK_AROUND_FAST_FUNC
coro LOOK_AROUND_FAST_SERIES
coro HEAD_SHAKE_FUNC
coro HEAD_SHAKE_FUNC_SERIES
coro EXPLANATION_FUNC
coro EXPLANATION_FUNC_SERIES
coro INIT_SLEEP_FUNC
coro INIT_SLEEP_FUNC_SERIES
coro INIT_BASE_FUNC
coro INIT_BASE_FUNC_SERIES
coro HANYOU_SAVE_FUNC
coro NORMAL_MESSAGE
coro NORMAL_EVENT
coro NORMAL_CAMERA
coro EVENT_FORMATION
coro EVENT_EVOLUTION
coro EFFECT_MOVE_DIVE
coro EFFECT_MOVE_WAVE
coro EVENT_DIVIDE
coro EVENT_DIVIDE_NEXT
coro EVENT_DIVIDE_INIT_FUNC
coro EVENT_DIVIDE_NEXT_DAY_FUNC
coro EVENT_DIVIDE_NEXT_DAY2_FUNC
coro EVENT_DIVIDE_FIRST
coro EVENT_DIVIDE_SECOND
coro EVENT_DIVIDE_AFTER
coro EVENT_DIVIDE_RESUME
coro EVENT_DIVIDE_SPECIAL_EPISODE
coro DEBUG_SCRIPT
coro DEBUG_SCENE
coro DEMO_CANCEL
coro DEBUG_FLAG_SETTING_BIPPA
coro DEBUG_FLAG_SETTING_PUPURIN
coro DEBUG_FLAG_SETTING_FUTURE
coro DEBUG_FLAG_SETTING_CHARMS
coro DEBUG_FLAG_SETTING_KIMAWARI
coro DEMO_01
coro DEMO_02
coro DEMO_03
coro DEMO_04
coro DEMO_05
coro DEMO_06
coro EVENT_M00A_01
coro EVENT_HA_YU_KI
coro EVENT_HA_YU_KI_DO
coro EVENT_HA_YU_SHU
coro EVENT_HA_YU_SHU_DO
coro EVENT_HA_CHO
coro EVENT_HA_CHO_DO
coro EVENT_HA_KI
coro EVENT_HA_YU_KIX
coro EVENT_HA_YU_KI_DOX
coro EVENT_HA_YU_SHUX
coro EVENT_HA_YU_SHU_DOX
coro EVENT_HA_SAME
coro HA_MIHARIBAN
coro EVENT_HA_SAMEX
coro EVENT_M00_01
coro EVENT_M00_02
coro EVENT_M00_03
coro EVENT_M00_04
coro EVENT_M00_05
coro EVENT_M00_06
coro EVENT_M00_07
coro EVENT_M00_08
coro EVENT_M00_09
coro EVENT_M00_12
coro EVENT_M00_13
coro EVENT_M00_14
coro EVENT_M01_01_02
coro EVENT_M01_03
coro EVENT_M01_04
coro EVENT_M01_05
coro EVENT_M01_06
coro EVENT_M01_07_08
coro EVENT_M02_01_02
coro EVENT_M02_03_04
coro EVENT_M02_05_07A
coro EVENT_M02_07B
coro EVENT_M02_09_10
coro EVENT_M03_01B
coro EVENT_M03_02
coro EVENT_M03_03
coro EVENT_M03_04
coro EVENT_M03_05_06
coro EVENT_M03_07A
coro EVENT_M03_07B
coro EVENT_M03_08
coro EVENT_M03_10_13
coro EVENT_M04_01
coro EVENT_M04_02_03
coro EVENT_M05_01_02
coro EVENT_M05_03
coro EVENT_M05_04
coro EVENT_M05_05
coro EVENT_M05_06_09
coro EVENT_M06_01
coro EVENT_M06_02
coro EVENT_M06_03
coro EVENT_M06_04
coro EVENT_M06_05
coro EVENT_M07_01_02
coro EVENT_M07_03
coro EVENT_M07_04
coro EVENT_M07_05
coro EVENT_M07_06
coro EVENT_M07_07_12
coro EVENT_M07_13
coro EVENT_M07_14
coro EVENT_M08_01_02
coro EVENT_M08_03
coro EVENT_M08_04
coro EVENT_M08_05_06
coro EVENT_M08_07
coro EVENT_M08_08
coro EVENT_M08_09
coro EVENT_M08_10
coro EVENT_M08_11
coro EVENT_M08_12
coro EVENT_M08_13
coro EVENT_M09_01
coro EVENT_M09_02
coro EVENT_M09_03
coro EVENT_M09_04
coro EVENT_M09_05
coro EVENT_M09_06_07
coro EVENT_M10_01
coro EVENT_M10_02
coro EVENT_M10_03
coro EVENT_M10_04
coro EVENT_M10_05
coro EVENT_M10_06
coro EVENT_M10_07
coro EVENT_M10_08
coro EVENT_M10_09
coro EVENT_M10_10
coro EVENT_M10_11_12
coro EVENT_M11_01
coro EVENT_M11_02
coro EVENT_M11_03
coro EVENT_M11_04
coro EVENT_M11_05
coro EVENT_M11_06_07
coro EVENT_M12_01
coro EVENT_M12_02
coro EVENT_M12_03A
coro EVENT_M12_03B
coro EVENT_M12_04
coro EVENT_M12_05
coro EVENT_M12_06
coro EVENT_M12_07
coro EVENT_M12_08
coro EVENT_M12_09
coro EVENT_M12_10_12
coro EVENT_M13_01
coro EVENT_M13_02
coro EVENT_M13_03
coro EVENT_M13_04
coro EVENT_M13_05A
coro EVENT_M13_05B
coro EVENT_M13_06
coro EVENT_M13_07
coro EVENT_M13_08
coro EVENT_M13_09