Well, I'll be completely honest. I haven't finished reading all of the posts above, but I wanna put this down before I forget.
I'm kinda surprised at the lack of what has been the go-to shit typing for over a decade now (or until Aurorus was released): Bug/Flying. I don't think I need to give any examples of shit Pokémon who share this typing. However, I think this is a good typing to exemplify both jas' and imanalt's questions. First of all, What are examples of Pokemon with "bad" typings that really fail to take advantage of the typings benefits? Unless you've been living under a rock for the past nineteen years, you know who these are. However, there's a real argument to be made for the strong points of this typing. The ones that immediately come to mind are its amazing 4x resistance to Fighting-type moves and its immunity to Ground type moves (and to a lesser extent, a 4x resistance to Grass-type moves), as well as immunities to Sticky Web, Spikes and Toxic Spikes. Offensively, the Flying type is a known commodity at this point, with Birdspam teams being ever-present back in early XY thanks to the Flying type only being resisted by three other types. On the other hand, the Bug type has decent coverage along with Flying, with only Steel-types resisting both, and the combination being resisted by only seven Pokémon in the top 49 of OU usage (by 1825 stats): Heatran, Skarmory, Excadrill, Thundurus, Magnezone, Diancie and Zapdos. Both types have really good STAB options: Hurricane has high BP and confusion chance, Acrobatics has high BP without an item and no recoil and Brave Bird has even higher BP. On the Bug side, Megahorn has high BP with no recoil and Bug Buzz hits through Substitute, while U-Turn is one of the best utility moves in the game for its ability to keep momentum. Also, the two types typically have access to some great moves, with Roost, Defog, Powder moves, Sticky Web, Tailwind and Quiver Dance immediately coming to mind.
So, why do these mons typically blow? First of all, the average BST for FE non-Mega Bug/Flying types is a whopping 437. Second, there's the issue of a 4x weakness to Rock, which also negates both the defensive attributes of the type (it's pretty hard to come in on resisted hits when simply coming in shaves off half of your health and most of the things you're trying to come in on have Rock coverage) and the utility of U-Turn (again, losing half your health by switching).
Now, for imanalt's question. I know there's no OU Pokémon with this typing, but I think we have a decently close comparison in Volcarona. The crippling 4x weakness to rock is there, exchanging the immunity to Ground for neutralities to Fire, Electric and Ice and a weakness to Water. Still, Volcarona has a lot of the positive traits mentioned above: access to reliable dual STABs with good coverage (even sometimes running Hurricane back in BW for Flying coverage), reliable recovery and an amazing boosting move in Quiver Dance. What separates Volcarona from stuff like Masquerain or Mothim that share the 4x Rock weakness and access to Quiver Dance along with a good offensive typing, as far as I can tell, is the BST.
Also, there's a good case to be made for Rotom-F, but I'm kinda short on time right now so that'll have to wait.
I'm kinda surprised at the lack of what has been the go-to shit typing for over a decade now (or until Aurorus was released): Bug/Flying. I don't think I need to give any examples of shit Pokémon who share this typing. However, I think this is a good typing to exemplify both jas' and imanalt's questions. First of all, What are examples of Pokemon with "bad" typings that really fail to take advantage of the typings benefits? Unless you've been living under a rock for the past nineteen years, you know who these are. However, there's a real argument to be made for the strong points of this typing. The ones that immediately come to mind are its amazing 4x resistance to Fighting-type moves and its immunity to Ground type moves (and to a lesser extent, a 4x resistance to Grass-type moves), as well as immunities to Sticky Web, Spikes and Toxic Spikes. Offensively, the Flying type is a known commodity at this point, with Birdspam teams being ever-present back in early XY thanks to the Flying type only being resisted by three other types. On the other hand, the Bug type has decent coverage along with Flying, with only Steel-types resisting both, and the combination being resisted by only seven Pokémon in the top 49 of OU usage (by 1825 stats): Heatran, Skarmory, Excadrill, Thundurus, Magnezone, Diancie and Zapdos. Both types have really good STAB options: Hurricane has high BP and confusion chance, Acrobatics has high BP without an item and no recoil and Brave Bird has even higher BP. On the Bug side, Megahorn has high BP with no recoil and Bug Buzz hits through Substitute, while U-Turn is one of the best utility moves in the game for its ability to keep momentum. Also, the two types typically have access to some great moves, with Roost, Defog, Powder moves, Sticky Web, Tailwind and Quiver Dance immediately coming to mind.
So, why do these mons typically blow? First of all, the average BST for FE non-Mega Bug/Flying types is a whopping 437. Second, there's the issue of a 4x weakness to Rock, which also negates both the defensive attributes of the type (it's pretty hard to come in on resisted hits when simply coming in shaves off half of your health and most of the things you're trying to come in on have Rock coverage) and the utility of U-Turn (again, losing half your health by switching).
Now, for imanalt's question. I know there's no OU Pokémon with this typing, but I think we have a decently close comparison in Volcarona. The crippling 4x weakness to rock is there, exchanging the immunity to Ground for neutralities to Fire, Electric and Ice and a weakness to Water. Still, Volcarona has a lot of the positive traits mentioned above: access to reliable dual STABs with good coverage (even sometimes running Hurricane back in BW for Flying coverage), reliable recovery and an amazing boosting move in Quiver Dance. What separates Volcarona from stuff like Masquerain or Mothim that share the 4x Rock weakness and access to Quiver Dance along with a good offensive typing, as far as I can tell, is the BST.
Also, there's a good case to be made for Rotom-F, but I'm kinda short on time right now so that'll have to wait.
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