1.Stats: Should Manectric get a stat boost, Evolution, Mega Evolution or nothing?
Both Manectric and Electrike should have +25 BST to match Houndour and Houndoom.
Manectric should have an alternate Mega with dual typing.
Manectric definitely deserved an evolution or a middle stage, but that is out of the picture now. It needs a Physical side evo, however.
2.Should Manectric get more abilities?
Maybe? Its abilities are decent but not too important. Competitive and Strong Jaw could work.
3.Should Manectric get more moves?
Definitely, the entire reason Manectric is terrible is its lack of moves. It needs strong moves like Shadow Ball, Dazzling Gleam, Grass Knot, Dark Pulse and Nasty Plot.
4.What additional typing Manectric can have?
Dark, Fire and Normal are the only logical options, sadly.