Adding missing natures.

lib/Rsaves/Constants/Emerald/Natures.pm

@@ -0,0 +1,21 @@
+package Rsaves::Constants::Emerald::Natures;
+
+use v5.16.3;
+
+use strict;
+use warnings;
+
+our @NATURES = (
+    'HARDY',   'LONELY',  'BRAVE',  'ADAMANT', 'NAUGHTY', 'BOLD',
+    'DOCILE',  'RELAXED', 'IMPISH', 'LAX',     'TIMID',   'HASTY',
+    'SERIOUS', 'JOLLY',   'NAIVE',  'MODEST',  'MILD',    'QUIET',
+    'BASHFUL', 'RASH',    'CALM',   'GENTLE',  'SASSY',   'CAREFUL',
+    'QUIRKY',
+);
+
+our %NATURE_TO_ID;
+for (my $i = 0; $i < scalar @NATURES; $i++) {
+    my $nature = $NATURES[$i];
+    $NATURE_TO_ID{$nature} = $i;
+}
+1;