This is my first attempt at a serious post. English is not my first language, so I hope you will excuse little grammar mistakes here and there.
I have noticed that when most people decide to use a UU/NU Pokémon in their teams, it is not because that Pokémon performs the needed role better than any other candidate.
People normally use those Pokémon as gimmicks, to add an element of surprise to their teams. There are some people who use UU Pokémon because "it's cool", in situations where an OU Pokémon would fit much better in the team. I am not saying that using gimmicks is wrong, or detrimental to a team.
What I mean is that, when building a team, most people will look at the current OU tier as the only list of playable Pokémon. I think that is not the correct way of making a good team.
The OU tier is a list of the most USED Pokémon, not necessarily the best ones (though, in most cases, they are) which means that a good OU team should be able to beat teams composed of any OU Pokémon. The tier should be used as an indicator of what kind of Pokémon your OU team is going to face.
In some cases, a Pokémon is UU because the role it performs best is very situational. What if your team needs a Pokémon to fit exactly that role? Let me give some examples.
Gastrodon (NU)
A typical Curse Gastrodon will have 425 HP, 202 Attack, 174 Defense and 289 Special Defense.
A typical Curse Swampert will have 404 HP, 256 Attack, 256 Defense and 240 Special Defense.
However, what you don't see in those stats is that Gastrodon learns Recover, in addition to being immune to Trick due to its ability, Sticky Hold.
Which means that, in a team that gets many free turns, a Gastrodon will actually perform better than a Swampert. (I am only comparing the Curse sets of both Pokémon, I am NOT saying that Swampert is a worse Pokémon). Once Gastrodon gets a couple of Curses it can mantain them way better than Swampert.
Should you always use Gastrodon instead of Swampert? No. Gastrodon has worse stats and does not learn Stealth Rock or Roar. But Gastrodon is not a worse Swampert. They are different Pokémon that fulfill different, but similar roles.
Another good example would be Machamp VS Hariyama. I won't go into detail here but there are several situations where a Hariyama would do better.
There are also Pokémon who don't have a "better" counterpart in a higher tier.
I have been using a Jumpluff in OU for some time. Jumpluff can be a very difficult Pokémon to take down, with a 350 Speed Encore + Subseeding (in addition to Sleep Powder for emergencies). If your opponent is without a Grass Pokémon or a really fast Ice Pokémon, it may very well mean he's lost the match once Jumpluff comes out.
Conclusion (tl;dr)
All Pokémon are different. Most Pokémon can do something special that no other Pokémon can do. The OU tier should be used as what it is: a list of which Pokémon you will most likely face in an OU match. Don't discriminate Pokémon in the lower tiers, they may be just what your team needs.
And in case someone missed my point: I am not necessarily saying that UU Pokémon should be used more. I am merely saying that a good team builder will consider ALL Pokémon when making a team, and not only some.
Thanks for reading.
I have noticed that when most people decide to use a UU/NU Pokémon in their teams, it is not because that Pokémon performs the needed role better than any other candidate.
People normally use those Pokémon as gimmicks, to add an element of surprise to their teams. There are some people who use UU Pokémon because "it's cool", in situations where an OU Pokémon would fit much better in the team. I am not saying that using gimmicks is wrong, or detrimental to a team.
What I mean is that, when building a team, most people will look at the current OU tier as the only list of playable Pokémon. I think that is not the correct way of making a good team.
The OU tier is a list of the most USED Pokémon, not necessarily the best ones (though, in most cases, they are) which means that a good OU team should be able to beat teams composed of any OU Pokémon. The tier should be used as an indicator of what kind of Pokémon your OU team is going to face.
In some cases, a Pokémon is UU because the role it performs best is very situational. What if your team needs a Pokémon to fit exactly that role? Let me give some examples.
A typical Curse Gastrodon will have 425 HP, 202 Attack, 174 Defense and 289 Special Defense.
A typical Curse Swampert will have 404 HP, 256 Attack, 256 Defense and 240 Special Defense.
However, what you don't see in those stats is that Gastrodon learns Recover, in addition to being immune to Trick due to its ability, Sticky Hold.
Which means that, in a team that gets many free turns, a Gastrodon will actually perform better than a Swampert. (I am only comparing the Curse sets of both Pokémon, I am NOT saying that Swampert is a worse Pokémon). Once Gastrodon gets a couple of Curses it can mantain them way better than Swampert.
Should you always use Gastrodon instead of Swampert? No. Gastrodon has worse stats and does not learn Stealth Rock or Roar. But Gastrodon is not a worse Swampert. They are different Pokémon that fulfill different, but similar roles.
Another good example would be Machamp VS Hariyama. I won't go into detail here but there are several situations where a Hariyama would do better.
There are also Pokémon who don't have a "better" counterpart in a higher tier.
I have been using a Jumpluff in OU for some time. Jumpluff can be a very difficult Pokémon to take down, with a 350 Speed Encore + Subseeding (in addition to Sleep Powder for emergencies). If your opponent is without a Grass Pokémon or a really fast Ice Pokémon, it may very well mean he's lost the match once Jumpluff comes out.
Conclusion (tl;dr)
All Pokémon are different. Most Pokémon can do something special that no other Pokémon can do. The OU tier should be used as what it is: a list of which Pokémon you will most likely face in an OU match. Don't discriminate Pokémon in the lower tiers, they may be just what your team needs.
And in case someone missed my point: I am not necessarily saying that UU Pokémon should be used more. I am merely saying that a good team builder will consider ALL Pokémon when making a team, and not only some.
Thanks for reading.