Well the thread is finally active after around 2 weeks, so why not do this nomination:
Omastar: A=>B (Rock)
Omastar pretty much only serves one specific purpose on Rock: sweeping Ground. But outside of that one matchup, it doesn't exactly do very well in a lot of other matchups thanks to having a mediocre presence against many prevalent balanced types like Water and Normal, and not being able to find the safest setup opportunities against offensive types like Fairy and Bug. It's a similar case to that of Alolan Golem, another B ranked Pokemon, in its niche appeal(except Alolan Golem can actually do something substantial outside of the Steel matchup). And even then, I'd go as far as to say that Rock v Ground is pretty much even. With Sticky Web support, mons like Mega Diancie, Scarf Terrakion, and Nihilego can severely pressure Ground, and if Exca tries to click Rapid Spin, it risks getting trapped by Alolan Golem if it's choiced. Rhyperior also blanket checks nearly every physical attacker Ground has, and Cradily can very easily switch into and beat the defensive core. Here are a few replays so that this doesn't sound like complete theorycrafting:
http://replay.pokemonshowdown.com/gen7monotype-632137659
With the added offensive pressure offered by Nihilego, alongside its amazing speed tier, it was a better immediate offensive threat than Omastar would be in this matchup. Here's another replay against a different Ground team:
http://replay.pokemonshowdown.com/gen7monotype-616681560
In this match, Alolan Golem was able to trap and remove Excadrill early-game when it tried to click Iron Head, allowing Mega Diancie to outspeed and threaten the entire team under Sticky Web. Cradily was also able to switch into and beat Lando-T, and once Mega Camerupt was removed, Cradily+Mega Diancie proceeded to win the rest of the game.
While the matchup without Omastar ends up being a cesspool of 50-50's, Omastar doesn't even completely guarantee this matchup. If the Excadrill isn't choiced, it won't have to fear being trapped by Alolan Golem, and if Dugtrio is also on the team, all it needs is a Rapid Spin to maintain the Sash and Omastar just gets removed. Omastar is just not too great in the current metagame, and when Rock has to fit Mega Diancie, Terrak, Ttar, Shuckle, and the designated Mega Scizor check, Cradily and Nihilego are simply more worthy of that final teamslot, with Cradily being a pretty consistent Mega Diancie check and Water immunity, and Nihilego serving as a great secondary special wallbreaker with some nice synergizing coverage in Tbolt, Grass Knot, and Hidden Power Ice to offer some solid offensive pressure in the aforementioned Water matchup and the Ground matchup. Overall, Omastar definitely needs to drop to B rank.
Omastar: A=>B (Rock)
Omastar pretty much only serves one specific purpose on Rock: sweeping Ground. But outside of that one matchup, it doesn't exactly do very well in a lot of other matchups thanks to having a mediocre presence against many prevalent balanced types like Water and Normal, and not being able to find the safest setup opportunities against offensive types like Fairy and Bug. It's a similar case to that of Alolan Golem, another B ranked Pokemon, in its niche appeal(except Alolan Golem can actually do something substantial outside of the Steel matchup). And even then, I'd go as far as to say that Rock v Ground is pretty much even. With Sticky Web support, mons like Mega Diancie, Scarf Terrakion, and Nihilego can severely pressure Ground, and if Exca tries to click Rapid Spin, it risks getting trapped by Alolan Golem if it's choiced. Rhyperior also blanket checks nearly every physical attacker Ground has, and Cradily can very easily switch into and beat the defensive core. Here are a few replays so that this doesn't sound like complete theorycrafting:
http://replay.pokemonshowdown.com/gen7monotype-632137659
With the added offensive pressure offered by Nihilego, alongside its amazing speed tier, it was a better immediate offensive threat than Omastar would be in this matchup. Here's another replay against a different Ground team:
http://replay.pokemonshowdown.com/gen7monotype-616681560
In this match, Alolan Golem was able to trap and remove Excadrill early-game when it tried to click Iron Head, allowing Mega Diancie to outspeed and threaten the entire team under Sticky Web. Cradily was also able to switch into and beat Lando-T, and once Mega Camerupt was removed, Cradily+Mega Diancie proceeded to win the rest of the game.
While the matchup without Omastar ends up being a cesspool of 50-50's, Omastar doesn't even completely guarantee this matchup. If the Excadrill isn't choiced, it won't have to fear being trapped by Alolan Golem, and if Dugtrio is also on the team, all it needs is a Rapid Spin to maintain the Sash and Omastar just gets removed. Omastar is just not too great in the current metagame, and when Rock has to fit Mega Diancie, Terrak, Ttar, Shuckle, and the designated Mega Scizor check, Cradily and Nihilego are simply more worthy of that final teamslot, with Cradily being a pretty consistent Mega Diancie check and Water immunity, and Nihilego serving as a great secondary special wallbreaker with some nice synergizing coverage in Tbolt, Grass Knot, and Hidden Power Ice to offer some solid offensive pressure in the aforementioned Water matchup and the Ground matchup. Overall, Omastar definitely needs to drop to B rank.
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