Removed trailing spaces in the most relevant files

Command used for the job:
egrep -rl ' $' --include *.c --include *.h --include  *.s --include  *.inc --include  *.txt *  | xargs sed -i 's/\s\+$//g'

Credits to Grant Murphy from Stack Overflow.

include/constants/pokemon.h

@@ -225,7 +225,7 @@
 // 1 bit each in the Pokémon struct. Gen 4 hard-codes
 // each of these to the given name. In Gen 3 they're
 // used to get an index into giftRibbons in the save block,
-// which can have a value 0-64 (0 is 'no ribbon') that 
+// which can have a value 0-64 (0 is 'no ribbon') that
 // corresponds to one of the special ribbons listed
 // in gGiftRibbonDescriptionPointers. Most of these were
 // never distributed