What happens to Immunities in Inverse Battles?

Question

Inverse Battles change the type chart to the exact opposite of what it is. So, for example, you use Psychic on a Toxicroak it would do 1/4 damage, instead of the normal 4x.

My question is, how effective are moves that normally do 0x damage? So, for example, if I used Sludge Bomb on a Skarmory, how much damage would it do?

Answer 1

According to Serebii they are inverted and do the damage as if the Pokemon was not immune.

Serebii

Comments

so does that mean they do 1x damage? Or are they super-effective?

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It looks like everything is Super Effective to stuff it didn't have an effect on.

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thanks