1) we will remake the battle system at some point , to make it perfect, so all related bugs will be fixed, but it will take sometime until we get there.
2)we will look that up
3) metapod defense does not go to infinity, it only go up to stage 6, however the "description text" says a wrong information. what I mean is: after you reach maximun stage the game will not change your status anymore, but will also not tell you the move is failing.
Thanks for reporting, the game will get much better!