Coming from your post in this thread regarding Autotomize buffing movement speed, I have to disagree with Tailwind specifically for multiple reasons.
Yes, Tailwind does buff movement speed in the main games, however, since PMU mechanics are quite different from the main games, I feel like a party move that buffs movement speed would be broken. Every time you load onto a floor, if you’re with a party, everyone would be able to get up to x4 speed by just using one button. You can clear floors entirely extremely quickly, and use it whenever you want to. That removes a lot of the game, as well as making the game seem a lot less difficult overall if you were to run with others who had that move. Looking at it alone, it definitely would be overpowered in a sense that it makes the game too easy and you can clear floors too quickly.
You mentioned how you felt like it wouldn’t be as overpowered as moves such as Beat Up. Let’s look at Beat Up on its own.
Beat Up warps every party member to the same room as the user. Say, you were to find the stairs before everyone else, you can use Beat Up to warp everyone there and continue with the dungeon. It’s handy, and in some dungeons, it does defeat a lot of difficulty that it may have. However, when you compare these moves, there are a lot of things that Tailwind does have that Beat Up does not. For one, Beat Up only warps others to the same room as you. When using Tailwind, everyone gets that speed buff, so if you’re in a dungeon for experience, everyone can quickly clear floors and simply move to the stairs and repeat. Beat Up can’t do that. You couldn’t practically use Beat Up on every single room, so that you can just warp everyone quickly throughout the floor, there’s not enough PP for that. Speaking of PP, Beat Up only has 18. Tailwind has 25. If you’re in a dungeon that has 60 floors, you would only have to use a PP item on that Tailwind pokemon twice throughout the entire dungeon (if it were, say, a max PP healing item). With Beat Up, you’d have to use at least 3 max healing PP items, and another healing PP item (like a Leppa Berry or an Ether), so you have a lot more opportunities to use Tailwind than Beat Up without using as many resources. I’d also like to add that it “wearing off”, would still not be much of an issue just because it has so much PP. It still would have those problems of the move being too OP.
But that’s not the only problem between Beat Up and Tailwind. Let’s take a look a how many pokemon get each move and the methods of obtaining them.
18 pokemon (including evolutions) get Beat Up. Beat Up is either learned by level up or by egg move. 100 pokemon get Tailwind (not including legendaries). Tailwind can be learned by level up, egg moves, AND by tutors with the use of green shards. This means that a lot more pokemon have access to a move like this, a status move with 25 PP that gives every party member double movement speed. I have a hard time agreeing that this move isn’t more overpowered than Beat Up, and other moves of the like (like ally switch, another move that’s obtained by tutor, but it only warps one pokemon instead of everyone, and you yourself are also warped).
I just couldn’t see this move working this way in PMU, it brings up a lot of problems with difficulty and overall mechanics in the game.
When I look at Autotomize, I’d like to imagine it has the same effect as moves such as Agility and Rock Polish; it is a single target move that buffs speed. Since there are other moves like that, and not a lot of pokemon get Autotomize (obtaining by level up and egg move only), I think it would be a lot more fair to at least buff that over something so universal, like Tailwind
