1.Stats: Should Gourgeist get a stat boost, Evolution, Mega Evolution or nothing?
+10 BST to update Gourgeist would be neat.
An evolution can work, though would be weird.
A Mega would be cool, but would require a decent Ability, and be fitting for all forms.
2.Should Gourgeist get more abilities?
Probably. Regenerator would have been cool, so would Intimidate.
3.Should Gourgeist get more moves?
Flare Blitz and Recover are the most obvious missing moves.
4.What additional typing Gourgeist can have?
Dark, Psychic and Fire are the obvious choices.