Add 'stat_changes' entries for 4 moves

Included the missing 'stat_changes' for Stockpile, Memento, Defog, and Shell Smash to accurately reflect their in-game effects.

Author: JintoYamanaka

data/v2/csv/move_meta_stat_changes.csv

@@ -48,7 +48,11 @@ move_id,stat_id,change
 246,6,1
 247,5,-1
 249,3,-1
+254,3,1
+254,5,1
 260,4,1
+262,2,-2
+262,4,-2
 268,5,1
 276,2,-1
 276,3,-1
@@ -94,6 +98,7 @@ move_id,stat_id,change
 426,7,-1
 429,7,-1
 430,5,-1
+432,8,-1
 434,4,-2
 437,4,-2
 445,4,-2
@@ -118,6 +123,11 @@ move_id,stat_id,change
 489,7,1
 490,6,-1
 491,5,-2
+504,3,-1
+504,5,-1
+504,2,2
+504,4,2
+504,6,2
 508,2,1
 508,6,2
 522,4,-1