Do a Pokemon's IVs begin to show actual amounts when reached a certain level?

Do a Pokemon’s IVs begin to show actual amounts when reached a certain level, or are the distributed randomly as your Pokemon levels up (like EVs)?

^ The question was too long, so here is the full question.

So like the question title says, will a Pokemon’s IVs be distributed and clearly shown when they reach a certain level or is it distributed randomly as they level up?

Example: So obviously it is nearly impossible to tell a Pokemon’s IVs at Level 1, where there are only minor differences in stats by 1 or 2, but when they reach higher levels (lets say Lv. 30) it will begin to show more specific differences in stats between the two Pokemon. Let’s say I have two Lv. 1 Axew with Attack stats of4and5, both Adamant nature.Say when they reach Lv. 30 (with absolutely 0 EVs) their attack stats reach66and69.

Given the two amounts, is itabsolutethat the second Axew (with 69 Attack) will have higher IVs then the first Axew (with 66 Attack)?

And is this a reliable way to count on without leveling them further?

I went on PO, and selected 2 Axew on the teambuilder.I made one of them have 30 IVs in Atk, and the other one have 31 IVs in Atk. Both had Hardy Nature, and had NO EVs.I set them both at Level 1, and started to level them up. Here’s the results:

Key- Bold: Level, Plain text: Attack Stat

From this test, I will now conclude that the IVs are like EVs: They accumulate over time. Level 20 is where this one shows up. But, Not all situations will be like this. Some will show at Level 1. For example:

Axew#3: 12 IVs16

While the Axew#1 and #2 have 7 Atk stat, we see here that this one has 6, indicating a lower IV from level one.

In conclusion, IVs can differentiate in a variety of levels, and accumulate over time.

We can see here that IVs are shown at higher levels, Level 40 being the case.

Hope this helps, and if it doesn’t, comment.