1.Stats: Should Hitmontop get a stat boost, Evolution, Mega Evolution or nothing?
Hitmontop suffers the same issues as Hitmonchan, while it is fitting for all three options competitively, it is only fitting for an evolution thematically and for in-game.
+80 BST is the highest it can get without a Mega, however.
2.Should Hitmontop get more abilities?
Yes, but since it already has three, the following would be purely theoretical:
- Iron Fist
- Sheer Force
- Speed Boost
Most obvious move would be Sucker Punch. Outside of this, some sort of a recovery move and Swords Dance, and access to other weak moves like Shadow Punch or Force Palm would be nice as well.
4.What additional typing Hitmontop can have?
Normal and Dark are the most obvious ones, followed by Rock and Ground.