through TryBecomeLinkLeader

ld_script.txt

@@ -241,6 +241,7 @@ SECTIONS {
         src/mailbox_pc.o(.text);
         src/menu.o(.text);
         src/quest_log.o(.text);
+        src/union_room.o(.text);
         asm/union_room.o(.text);
         asm/union_room_player_avatar.o(.text);
         asm/pokemon_special_anim.o(.text);