Inkay sidequest bugged?

[Pokenerd2112]

guy ask you to stop the inkay. They wont go away no matter how much I battle them and no other npc in the area seems to do anything. This a bug or am I just dumb? 

[AenUndod]

You have to catch them.

[Pokenerd2112]

I feel pretty dumb right now thank you XD