its effects ?

Here is a site for you to check out that has all sorts of info like this:

 

https://pokemondb.net/move/all

 

Go ahead and search "Focus Slash" and you'll find all the info you'll need. :)

 

Have fun on your Pokemon Journey.

 

EDIT: Upon actually searching, Focus Slash isn't a move. You'll find moves that you may have meant in the search, though.

.......very sure he/she meant Focus Sash, the hold item that acts as Sturdy ability for one time only.

218191 its effects ?

218197 .......very sure he/she meant Focus Sash, the hold item that acts as Sturdy ability for one time only.

 

Quoted for visibility.

 

Starlight is correct. Focus Sash is a one-time use held item which prevents your Pokemon from being OHKO'd.

Where can i get a focus sash??

246373 Where can i get a focus sash??

You can get a Focus Sash randomly as a reward from certain boss NPCs.

 

Locking the topic as resolved.