1.Stats: Should Wigglytuff get a stat boost, Evolution, Mega Evolution or nothing?
+105 BST can be given. But earlier than that +50 BST can be given to all stages to match Clefable.
A side-evolution would be good.
A Mega would be a waste.
2.Should Wigglytuff get more abilities?
Prankster would be good.
3.Should Wigglytuff get more moves?
Slack Off can be given.
4.What additional typing Wigglytuff can have?
Dark, Psychic are options.