Initial work on pokemon_summary_screen.c

ld_script.txt

@@ -268,6 +268,7 @@ SECTIONS {
         src/tm_case.o(.text);
         src/menu_indicators.o(.text);
         src/pokedex_area_markers.o(.text);
+        src/pokemon_summary_screen.o(.text);
         asm/pokemon_summary_screen.o(.text);
         src/help_system.o(.text);
         src/wild_pokemon_area.o(.text);