The metagame has definitely changed a lot since the creation of RU. Many Pokemon that were once viable and good are now considered to be complete jokes, up to the point where one can consider the opponent a complete noob or a total joke for using them. This thread is for discussing the Pokemon that have fallen and why they fell to their current position in the RU metagame.
I'll start.
Mandibuzz (F) @ Leftovers
Trait: Overcoat
EVs: 248 HP / 8 Def / 252 SDef
Careful Nature (+SDef, -SAtk)
- Taunt
- Roost
- Whirlwind
- Brave Bird / Toxic
Mandibuzz used to be a staple on stall teams, and was a solid choice during the hail meta for hail teams since it was a solid wall that was immune to hail. It was also a major pain for my awesome TR Hail team. Its ability to phaze and shut down walls with Taunt was greatly appreciated. It could stop the ever-popular OTR Cofagrigus easily, especially if it ran Toxic. However, it is simply not as good as it used to be. It cannot stand up to the new powerhouses in the tier, such as Nidoqueen and Moltres. It also takes major damage from Pokemon such as Escavalier, and be used as set-up fodder for Pokemon such as Taunt + SD Drapion and Smeargle. OTR Cofagrigus is just not as good as it was before, lowering Mandibuzz's niche even more.
I'll start.

Mandibuzz (F) @ Leftovers
Trait: Overcoat
EVs: 248 HP / 8 Def / 252 SDef
Careful Nature (+SDef, -SAtk)
- Taunt
- Roost
- Whirlwind
- Brave Bird / Toxic
Mandibuzz used to be a staple on stall teams, and was a solid choice during the hail meta for hail teams since it was a solid wall that was immune to hail. It was also a major pain for my awesome TR Hail team. Its ability to phaze and shut down walls with Taunt was greatly appreciated. It could stop the ever-popular OTR Cofagrigus easily, especially if it ran Toxic. However, it is simply not as good as it used to be. It cannot stand up to the new powerhouses in the tier, such as Nidoqueen and Moltres. It also takes major damage from Pokemon such as Escavalier, and be used as set-up fodder for Pokemon such as Taunt + SD Drapion and Smeargle. OTR Cofagrigus is just not as good as it was before, lowering Mandibuzz's niche even more.