The 4th Dimension is considered a perpendicular direction compared to the other three dimensions. The reason it's time in most universes is because they only ever prove three dimensions and a temporal axis which would give it a 4th dimensional property due to an uncountable infinite snapshot of universes.
For the thread we treat this Rick as a super genius and the object he's holding isn't the correct matrix which would make lifting it not an anti-feat.
Though the feat is still 5D and not 6D, as in the Rick and Morty cosmology time is a 4th dimensional construct as shown in the episode A Rickle in Time. Meaning it's not 5D+1 but just 5D since time is a lower dimension.
I said that the 4th dimension is "theoretically" time, I said this based on Einstein's theories, but some of us argue that the 4th dimension doesn't have to be time because there can be time in any dimension, which actually makes sense, but I looked at what is considered theoretically, according to string theory, the 4th dimension or extra spatial dimensions can be said because they believe that subatomic particles go in different spatial directions that we cannot see, but normally the 4th dimension is considered Time.
The Rick and morty universe is 4D, yes, there is no need to prove that, but there is no reason for it to be 5D, if it is going to be 5D, it should be possibly, and not on this scale. I mean Rick separated infinity from infinite multiverses and clustered a 2A infinity into universes where he is the most intelligent and the actual multiverse that is outside of that is probably l1c because it has to be infinitely bigger than him so that we can get a 2a structure when we can pull infinity from it.
At this scale all Rick is saying is that this stone extends to dimensions that we can't see, at this point it could be 5D 6D 7D and infinitely every dimension, but if we say irrelevant things like 6D from here we would be doing no limit fallacy.
In the episode you mentioned in the Rick and morty series, yes, Rick, who stops time universally, divides time into 2 by mistake and then again and again and again, here they probably refer to the cat experiment in the Quantum superposition theory, probably the purpose of this is that Rick can fail in one time and not in another time, but Rick was able to escape from there in every time, maybe this will be discussed later, but this is the episode in a nutshell.
I don't get a logical answer for giving 5D to cosmology here because this scale that embraces most of the defeats of the system is full of fallacies, there is no definite possibility and they act as if there is, and the most absurd part is that in this scale, to make the universe completely 5D from a single word is a hyperbole.
With the example given by the system; In a universe whose greatest achievement is the mountain level, it does not mean that a character who is claimed to have destroyed the Universe has destroyed that universe, and there is no possibility, no matter how smart he is, because we cannot speak without seeing what he has done.
Rick says that it extends to dimensions we cannot see and let me add before I forget the 4th dimension part, the W axis can be considered as the 4th dimension, that is, infinite points form a line with 1D, infinite lines form a square, this is 2D, infinite squares form a cube and infinite cubes form a tesseract, this is 4 dimensions.
Or that dimension that holds 2 parallel timelines together is the 5th dimension, not counting time, which is the 4th dimension.