Since you apparently play the tier, I'll explain why its unhealthy and ADV NU would benefit from removing it. I will do so in the most obnoxious way possible as well, crediting myself for the very pokemon that is Glalie. In doing this I will give a history of its sets and explain what it does which will later help me explain why it is so good. I explain the glalie sets through myself because I invented them all (unironically). So time to be a narcissist!! It all started one ADV NU cup in which I played NU. I wasn't great at the tier yet, but I was able to notice that the standard glalie set (taunt ice beam explosion spikes) was complete dogshit) and was appalled. I made it to the finals in which I played Heysup who is a wonderful player (and if I remember correctly I lucked him in my first ADV NU Cup victory). This is when I first started diversifying with Soft Sand and Nevermeltice Glalie. Soft Sand is particularly bad for the metagame because it ohkos uninvested flareon, really restricting ways of playing both within and outside of the team builder. The next two sets I came up with were LightScreen, SPD and Choice Band. Choice band is primarily to fuck over flareon who thought oh I can EV for soft sand, but also combo'd well with Roselia with the idea being spikes are so broken and only removable by hitmonchan meaning if your glalie boomed the opposing glalie and u had answers to their threats you more or less just won the game. Light screen does an amazing job setting up as quickly as possible, and SPD is a real winner because it lets glalie run things like spikes protect shadow ball explosion or ice beam spikes rest sleep talk which beat haunter, combo well with toxic etc, and if you play the tier you should understand just how amazing that is. It should be noted that there is so much u can do should u choose to drop explosion, and physdef is also a fine set. Torment is cool, but I never used it, Icy Wind can find fantastic use, etc
Now that I have explained what sets Glalie can run, you should notice a two things, 1. im a piece of shit, 2. glalie can run 10000 different sets. Now combine this with the fact that it is by far the best spikes setter, and notice how absolutely broken spikes are in ADV NU, its hard to make a good team without them because they touch everything, are hard to remove, and come on a pretty damn good pokemon. There is no diversity to the spikes metagame like in ADV OU. So with all that done I've established that its centralizing. With its centralizing nature out of the way we can now make the assumption that it is more or less on every team. What does a metagame with glalie on every team (i.e more or less the metagame that is played by those who do the best) look like?
Okay this is where the argument for its ban starts. Again to be clear we are assuming every team has glalie because its more or less true if you are going to play at "highest" level and doing so simplifies the argument with no malice. I don't care to articulate every single nuance.
Let's say the opponent has
Glalie, Hitmonchan, Sableye, X, Y, Z
while you have
Glalie, Hitmonchan, Haunter, X, Y, Z
OR
Let's say the opponent has
Glalie, Hitmonchan, A, B, C, D
while you have
Glalie, Haunter, No Hitmonchan, X, Y, Z
The opponent has Rapid Spin while your rapid spin is blocked so now the game requires you to get every turn regarding spin right to win the game, or to have an incredible matchup otherwise.
In a Glalie, Haunter, Hitmonchan, X, Y, Z mirror it remains some dogshit guessing contest.
I hope I have established that hitmonchan games end up being complete dogshit here because everything is so prediction reliant and such turns of this nature are inherently uncompetitive and their frequency should be avoided because it brings the lesser player closer to the better player because both players will have equal awareness of this one concept. The only solution to the opponent bringing hitmonchan is to 1. bring an overall worse roselia team, 2. bring sableye every game, 3. Boom their Glalie with yours and use a Roselia team. None of these are preferable and if you use these strategies every game you will get counterteamed. This is the number one factor here. Skill expression and building expression which is apart of it get ruined which brings worse players closer to the better players. Furthermore, there is increased room for bad matchups when your team relies on a pokemon that isn't a hard counter to anything in a metagame where no game truly ends up fitting the tempo associated with hyper offense. SPD Glalie somewhat helps with this making it an answer to something like Haunter, but even then it only goes so far. There is more I can say, but this should be more than enough to convince you that the tier is both less competitive and less fun explain why great players like Heysup said ADV NU is dogshit (or whatever he said idr). I am tired of writing and will stop after the first argument that came to mind.
Edit: I do want to add god forbid you have no spinblocker, then hitmonchan teams should just dismantle you, and having to use a ghost and glalie on every team and then do this and that oh em ge,...
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