Don't know if this was known yet, but I'll share what I found last night.
In the flag values for offensive collisions, there is a pair of numbers that seem to check whether or not your opponent is on the ground or in the air.
Like this:
3A831C42
From what I remember, the first number has to do with priority and the last three digits have to do with the graphic effect and sound effect of the attack.
That's all I really knew before, but I've come to find the bolded digits work in determining whether that particular collision bubble will appear or not given the condition of your opponent being on the ground or in the air.
In-game Examples:
Ike's Eruption: I found that there were two collision bubbles on the tip of the sword: both the exact same size and the exact same position. The only thing different were their flag values and the trajectory they sent opponents. One of the collision bubbles has a fire graphic, fire SFX, and sends them upwards, while the other bubble has no graphic, sword SFX, and spikes them downward. After much testing, the spiking bubble would only connect if the opponent was on the ground and the fire bubble would only connect if the opponent was in the air. They had flag values like this:
32810682 - Sword effect, spiking collision bubble.
32821085 - Fire effect collision bubble.
The noticeably different values are the ones I mentioned before. 10 and 21. I first tried swapping the flag values of these two collisions with positive results: The spiking collision now only worked on aerial opponents and the fire collision only effected grounded opponents. I then tried swapping these flag values with other attacks, such as a jab or a tilt. Results were promising: I made Ike's jab only connect with an opponent if they were on the ground and Ike's dash attack only connect with opponent who were in the air.
From looking at other attacks, these are some values I see:
10 - Offensive collision bubble will only be in effect if opponent is grounded.
21 - Offensive collision bubble will only be in effect if opponent is in the air.
22 - Offensive collision bubble will only be in effect if opponent is in the air.
11, 30, 31 - Offensive collision bubble will appear regardless of opponent's state.
Zelda's Dair - The strong hitbox lasts for 1 frame at the beginning of the attack, followed by the weak collision lasting for 10 frames after. The strong hitbox comes out on frame 14. If you use Zelda's Dair on a grounded opponent, you will NEVER see the strong hitbox, and the first frame the attack hits is on frame 15. It essentially skips that collision bubble entirely...it never shows. This collision had a flag value of 3BC220C3, the 22 being the determining factor as mentioned above. The weak hitbox appears later with flag values of 39830400.
Also found this in Ike's Aether. The part where Ike is plummeting downward, the sword sends opponents at a downward trajectory if they are in the air and in an upward trajectory if they are grounded.
So yeah, perhaps a longer explanation then what was needed, but I like to type sometimes. What I don't know yet is what other values in that position will cause, or whether they affect a different property. But I do know that these values work, and I can replicate the effect on any collision bubble.
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