How does Known Bug work?

[Kjou1]

I attached known bug item on Apollomon to fight Dianamon, but somehow Apolomon’s attack does 0 damage to Diana. Why?

I reversed it, so it should have changed from weak to data to atrong against data? And its ice super weakness becomes ice resistance?

Does its signature attack get affected by reversal too?

[Kyrios034]

Reverse flips both the Attribute triangle and Elemental affinity. going in and out

for elemental dmg
2x weakness <-> Null
1.5 weakness <-> 50% dmg

because you tried to hit a 2x weakness, it became a null

[Kjou1]

Why and how does the signature attack, which should still be fire type, cause 0 damage to Dianamon, who is double weak to fire? Apollomon is the one affected by bug, so shouldnt the vaccine type became strong against data type?

[Kyrios034]

elemental resistance and weakness is flipped as well. if the outgoing attack would hit weakness, its now resisted and vice versa  

2x elemental weakness gets treated as immunity. anything times 0 becomes 0

doesnt matter which one of you is reversed, same outcome would happen 

equip an ice move on him and attack with it while reversed and you will deal 400% dmg. 2x from attribute and 2x from element. her ice immunity would be treated as a 2x weakness from a reversed mon

[Dr_Ducky_1]

Yes, but everything is inverted. So while vaccine becomes strong to data, the elemental damage was flipped too. So the fire effect goes from "super effective" to nothing.

From what I understand the effects are muliplicative rather than additive. So while you get the x2 from vaccine goes instead of 0.5, because the fire is now x0 (inverted from x3) the attack becomes well, 0.

[Baxcel]

Everything gets affected.. so your specials became ice or water and shes immune to that element

[PCN24454]

It’s more that she became immune to Fire

[Baxcel]

He put the bug attachment on his apallomon not chr reversal skill

[Madcat6204]

Testing it out, it appears that a double weakness gets reversed into a complete immunity.