1.Stats: Should Zangoose get a stat boost, Evolution, Mega Evolution or nothing?
Zangoose can get most 82 BST.
Zangoose should get an evolution.
Zangoose would be useless with a Mega.
2.Should Zangoose get more abilities?
YES. Tough Claws is the most obvious option.
3.Should Zangoose get more moves?
Zangoose can get Drain Punch.
4.What additional typing Zangoose can have?
Fighting, Dark, and Electric are options.