move pokemon graphics to mon-specific directories

graphics/pokemon/walrein/normal.pal

@@ -0,0 +1,19 @@
+JASC-PAL
+0100
+16
+98 115 148
+49 82 123
+57 115 172
+90 139 197
+131 180 230
+164 131 90
+255 197 98
+255 222 131
+255 255 164
+197 49 49
+238 131 131
+123 180 255
+197 205 222
+0 0 0
+222 230 255
+255 255 255

graphics/pokemon/walrein/shiny.pal

@@ -0,0 +1,19 @@
+JASC-PAL
+0100
+16
+98 115 148
+82 74 123
+164 90 189
+197 131 222
+230 180 238
+164 131 90
+255 197 98
+255 222 131
+255 255 164
+197 49 49
+238 131 131
+123 180 255
+197 205 222
+0 0 0
+222 230 255
+255 255 255