Why did my Mewtwo Y's Rest fail?

Question

I was battling in Showdown with a Mewtwo Y, it was poisoned and I used Rest to heal the poison and get full HP, of course Mewtwo Y has Insomnia which means that the Pokemon cannot be asleep.

Did the Rest fail because of the poison/ability or was it a glitch from the game?

Comments

you answered your own question. it's like asking whether you have a broken leg after you break it. and you do mean which instead of whic right?

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Fixed.

Answer 1

You answer your own question really lol.

Regardless let me point it out: Because of Insomnia, moves that induce sleep to the user fail.
Yes that also self afflicted moves, like Rest

Source: You question has it:

was playing in Showdown with a Mewtwo Y, it was poisoned and I used Rest for heal the poison and get full HP, of course Mewtwo Y have Insomnia that the Pokemon cannot be under sleep.

Hope I helped!

Answer 2

It's because of the ability.

You cannot use Rest successfully if you have the ability Insomnia.

>Insomnia prevents the Pokémon from being afflicted by sleep and Yawn. Rest will fail when used by the Pokémon.

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Source
Hope I helped.