Haunter

Haunter's solid Speed tier allows it to outspeed a good portion of NU, including common Pokemon like Lilligant, Mesprit, and Rotom. Furthermore, simply between its dual STAB types Haunter has excellent neutral coverage, with a strong secondary STAB type that allows it to break through Pokemon that many Ghosts have trouble with, such as Pyroar and Mega Audino. This frees up Haunter's last two moveslots, allowing it to run neat support moves such as Will-O-Wisp, Destiny Bond, and Reflect Type. Unfortunately, Haunter has terrible bulk, meaning it can sometimes struggle to make proper use of these moves. With low stats in both HP and defenses, Haunter can only afford to take resisted attacks that have low Base Power or are uninvested. However, even with its horrific bulk, Levitate gives Haunter an impressive third immunity and helps its matchup versus offense, as it is not affected by Spikes. On the downside, Levitate also means Haunter cannot absorb Toxic Spikes, potentially leaving your team at a disadvantage versus teams employing them. Haunter faces competition from Ghost-types such as Rotom and Mismagius, the former of which acts as a better pivot due to STAB Volt Switch and better defenses, and the latter of which has access to Nasty Plot and a higher Speed tier.