Explicitly specify dependencies for teachable learnset helper (#6015)

Makefile

@@ -426,8 +426,8 @@ $(OBJ_DIR)/sym_common.ld: sym_common.txt $(C_OBJS) $(wildcard common_syms/*.txt)
 $(OBJ_DIR)/sym_ewram.ld: sym_ewram.txt
 	$(RAMSCRGEN) ewram_data $< ENGLISH > $@
 
-# NOTE: Depending on event_scripts.o is hacky, but we want to depend on everything event_scripts.s depends on without having to alter scaninc
-$(DATA_SRC_SUBDIR)/pokemon/teachable_learnsets.h: $(DATA_ASM_BUILDDIR)/event_scripts.o
+TEACHABLE_DEPS := $(shell find data/ -type f -name '*.inc') $(INCLUDE_DIRS)/constants/tms_hms.h $(C_SUBDIR)/pokemon.c
+$(DATA_SRC_SUBDIR)/pokemon/teachable_learnsets.h: $(TEACHABLE_DEPS)
 	python3 $(TOOLS_DIR)/learnset_helpers/teachable.py
 
 # Linker script