1.Stats: Should Simisear get a stat boost, Evolution, Mega Evolution or nothing?
Unlikely, Simisear already has a high gap.
An evolution would be fun, though.
A Mega would be a waste without a small boost.
2.Should Simisear get more abilities?
YES. Drought would be fun on Simisear.
3.Should Simisear get more moves?
More Punching moves and Swords Dance would be helpful
4.What additional typing Simisear can have?
Fighting, Dark, Normal can work.