A couple of questions about Struggle?

Question

1. If a Pokemon with the Rock Head ability used Struggle, would it receive recoil damage?
2. Can Struggle result in a critical hit? If so, would the recoil be doubled?

Answer 1

If a Pokemon has Rock head it will still take recoil damage.

>A Pokémon will still take recoil damage even if it has an Ability that would prevent it, such as Rock Head.

It can strike a critical hit, and the recoil would double.

Since you take 1/2 of the damage dealt, you would take more damage if it results in a critical hit.

>Struggle is capable of striking a critical hit.

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Source
Hope I helped.