To the "type moves above"...
This is all fine and dandy but did you forget what happened that one time they made a move that flips one of its type affinities?
No? Let me tell you, Freeze Dry broke or almost broke several of the pokemon that learn it, specifically because one the typical switch ins of ice type, water types, suddently aren't safe anymore (and in fact, with how many water + iceweak pokemon there are, the amount of stuff Freeze Dry hits supereffectively is quite insane).
So please no, we don't need moves that "change the type chart". Messing with the game systems often proves problematic, expecially longterm, unless balanced by very heavy negatives, see Freeze Dry or also Urshifu basically breaking the entire game by virtue of negating one of the most important aspects of the game ("clicking protect is always safe the first time").
I mean, this is why I said "a few" and not "all" - I think there is also much merit in it being one Pokemon's gimmick too (I have to admit I'd forgotten Corrosion's existence when I wrote that).
Re the example you cited, Ice is already a pretty strong offensive type so yes, Freeze-Dry did end up being rather overpowered
But going with the Acid example... Poison is quite a weak offensive type and if Acid were given a Steel-punishing effect while keeping its current 40 BP there's no way that'd be broken.
It doesn't literally have to be the types I cited either, they were just examples. I am not a master of game design but there are definitely ways to do this and not make it completely broken. And hey, if it is, they'll just remove the move in question in the next game anyhow.
They didn't change up teams in the main story, only rematches.
...I didn't say they did? I said they could have done, which is not the same thing.
Also you're not quite right about that in any case, Clair's team was changed and they altered the levels of some of the others.
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