Yeah... That's a bit OP. It's basically Flower Trick, but an Ability. BTW: Flower Trick is Meowscarada's signature move.

How should I nerf it

Not sure.

Make it so it can't miss if the move used is dark type?

...

Hm?

Idek... Just read your comment, with everything factored in.

Yeah... The ability says that after a pokemon uses a dark-type move, the POKEMON cannot miss for the rest of the battle, with any of it's other moves.

My idea for nerfing it was making it so only that dark type move that was used couldn't miss after it was used for the first time... Also another good idea would probably be to make it only work if you consecutively use dark type moves, using something of a different type would make the next dark move have an increased chance to miss the next time.

Ah. Oki.

Yee

I think you're misinterpreting it a little bit. The way it works is that if an enemy Pokemon uses a Dark type move, for that point on, any moves coming from the ability bearer targeting the Pokemon that used the Dark type move cannot miss and always crit. Hope this helps

Remove the always hitting part, only apply if ability holder was damaged by dark type move and then it's balanced.

Sounds a little op but it's unique atleast