1.Stats: Should Mienshao get a stat boost, Evolution, Mega Evolution or nothing?
Mienshao can get at most +30 BST. +15 BST to match Lucario is a bit more likely.
An Evolution can only work if it is specially oriented.
A Mega can be interesting, but would require a fun Ability.
2.Should Mienshao get more abilities?
Mienshao has very good abilities, and doesn't need much. Some options would be:
- Iron Fist
- Mold Breaker
Yes, particularly on the special stuff, Mienshao needs more Aura moves and Psychic/Shadow Ball/Energy Ball, and Power Whip. There other moves like Mach Punch and Extreme Speed can work.
4.What additional typing Mienshao can have?
Psychic, Normal and Rock are the most obvious options. Mienshao has a dry movepool so it has not too fulfilled its potential.