1.Stats: Should Wobbuffet get a stat boost, Evolution, Mega Evolution or nothing?
Wobbuffet can get +135 BST.
Wobbuffet should get an evolution.
Mega Wobbuffet can work, but it won't be too different from the regular one.
2.Should Wobbuffet get more abilities?
Magic Bounce would work.
3.Should Wobbuffet get more moves?
Mimic and Magic Coat would be good.
4.What additional typing Wobbuffet can have?
Ghost, Fighting and Normal can work.