Drifblim

Drifblim is an uncommon threat that can make good use of Unburden and its varied movepool to disrupt opposing teams. STAB Acrobatics, Hex, and Will-O-Wisp make it very hard to wall completely, as common Flying-resistant Pokemon such as Steelix and Rhydon are crippled by Will-O-Wisp and Hex while most specially defensive targets such as Skuntank, Magmortar, and Hariyama dislike taking a boosted Acrobatics. Combined with incredible Speed once Unburden has triggered and a solid range of resistances and immunities, Drifblim can cause a lot of trouble for unprepared teams once it enters battle safely. However, despite its strong moves, Drifblim lacks the power of other cleaners like Tauros and Archeops, which is further emphasized by its need to split its offensive investment and by both of its attacking moves having conditions for maximum power. It's also very difficult to hit a good middle ground between giving Acrobatics good cleaning power and Hex good wallbreaking power, meaning Drifblim often comes up short without heavy entry hazard support. Drifblim also struggles against most special attackers due to Will-O-Wisp not crippling them while still being necessary to use a strong Hex against them, especially if they have the Defense to take Acrobatics. Furthermore, its multiple type weaknesses combined with its low uninvested defensive stats make it hard to use defensively and make it difficult to preserve its Substitutes for long. Finally, while Unburden is useful and gives Drifblim a solid niche, it also allows only one chance to sweep during a match, so Drifblim can be dealt with easily if it tries to sweep early and gets forced out by a priority attack user.