When using rellor I used take down but it got repeated and I was not able to select another move resulting in a K.O instead of me being able to catch it
By the way the wild Pokemon was able to use it's turn in between 'my' moves
Yeah, that was pretty wierd.
It was definitely a glitch. No Pokemon (Except Kanghaskan... kinda) should repeat a move that isn't multi-turn. Additionally, Meditite has no ability that would trigger this, nor Rellor.
Such a mechanic doesn't exist.