Haunter

Despite being an NFE, Haunter is a great offensive spinblocker with good offensive presence and Speed. This ties in well with its great movepool, making Haunter an unpredictable Pokemon to face. Specifically, Haunter's access to support moves such as Destiny Bond, Disable, Pain Split, Trick, and Will-O-Wisp is what makes it so threatening. While it is incredibly frail, Haunter has excellent immunities to Normal-, Fighting-, and Ground-type moves that give it opportunities to switch in safely. Unfortunately, that frailty is still Haunter's downfall, as it is terribly weak to Pursuit and common priority users. Haunter's Speed might hit a great benchmark, but there are many Pokemon that can still outspeed it; Haunter also hates risking a Speed tie because of its frailty.