Mismagius (A-) (By Biboo & Me)
+ Available before Gym 1, Venam, as a repeatable event.
+ Levitate is the only choice of Ability, but a Ground Immunity is nice to add on with the Fighting and Normal Immunity. This also means Migmagius is a suitable partner for an Earthquaker in Doubles.
+ A nice special movepool to go along with Mismagius' nice Special Attack and Speed: Shadow Ball, Magical Leaf (Relearn), Power Gem. Mystical Fire (Relearn), Perish Song, Destiny Bond (Breed), Nasty Plot (Breed), Pain Split.
+ A great Special Defense.
+ Useful for Narcissa, if you outspeed. In addition, Perish Song/Destiny Bond can take out some bosses.
+ Nice Speed for OHKOing opponents who are weak to its Moves.
- Terrible Defense and HP...
- You have to get the moves you want on Misdreavus before evolving it, since some moves aren't available due to evolution by stone. In addition, many of Mismagius' offensive moves are available only by relearning.
Also, I'd rec. Typhlosion to A+ due to the sheer power and early availability of Eruption. Breaks one of the hardest battles in the game and is very useful for every Gym minus Valarie honestly.