REGISTEEL!!!!!!!!!!!!!!
OMG!!! I'm pretty sure this is just really really lucky but I got registeel to thin red health
And threw a pokeball and it shook the ball 2 times (move from side to side then said... argh , almost had it) then I threw another pokeball and it caught it!!!
I no this may sound wierd but this is the easiest way to explain (its one of those pokeball anhancer things) when you throw the ball press and hold down and B when the ball opens press up and B when the ball shuts press A,L and R and keep holding for the rest of the movement and also when the ball moves right or left (when it's on the ground) press right or left on you're directional pad and remember keep holding down A,L and R!!!
P.S. It may not work but I started getting better pokeball results with it...persides I caught registeel with 2 pokeballs!!!
We have more cheats and tips for this game here, Pokemon Ruby cheats
Comments for this hint