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People are sleeping on Rillaboom. It's a huge boon to offensive teams to have a Zeraora and Excadrill check that can actually do damage. Banded Wood Hammer hits hard enugh to OHKO some Toxapex and there's U-Turn for Corviknight. The speed tier is also honestly pretty good, it can run Adamant and...
Gastrodon comes to mind. It'll usually jump from NU/PU to OU at some point because it's a good anti-meta pick to counter some specific pokemon, usually a water or electric type. Then it'll often slowly slide back down the tiers when the meta shifts in a different direction.
In a similar vein...
Charizard-Mega-X @ Charizardite X
Ability: Blaze
EVs: 248 HP / 100 Def / 160 Spe
Impish Nature
- Will-O-Wisp
- Dragon Claw
- Roost
- Flare Blitz
Switches directly into bisharp and can fire off a will-o-wisp or roost. Doesn’t switch into lopunny, but wins 1-on-1 if it’s decently healthy, and...
Mamoswine @ Life Orb
Ability: Thick Fat
EVs: 252 Atk / 4 SpA / 252 Spe
Jolly Nature
- Earthquake
- Icicle Crash
- Ice Shard
- Knock Off
Mamoswine can switch into both gliscor and clefable and throw out a STAB move for a 2hko on either one. Knock off makes it much better at threatening common...
- What is your opponent's wincon?
SD Talonflame. Once heatran and lando are weakened and rocks are up, it can sweep really easily, and depending on the situation, might not even need to set up. Belly Drum Azumarill is another major threat, as it only needs kyurem weakened. With either one of...