I uses this all the time. Through hunting, trading, (And some GS) i have a copy of emerald with a copy of every pokemon available, and every Unknown form except for F. I use the clone glitch to trade them up to my dimond version without loosing my collection on emerald. I have easily cloned over 200 time, and over 300 pokemon.
BTW, if anyone wants some cool looking shiny's or some 3rd gen to 1st gen legends, pm me an offer. I have a decent Shiny Jirachi.
The clone glitch is wonderful if you're into the whole shiny trade thing, since it's technically legit. ( No action replay, pokeSAV, etc.) Only using the failed programming of nintendo to create armies of pokemon in Hoenn. Of course, now that i spent 3 months soft resetting a black rayquaza, it's only natural i'd clone a couple boxes full. And on the way there a green wingull.
By the way: Does anyone know when there're going to fix the RNG reporter 8.31 link? I would like to abuse my Emerald even more (-^U^-)
I'm not really fond of ruining my game either, but if I've recieves hacked items, is my game ruined anyway? I got a Master Ball and a Jirachi, both hacked, from friends. I used a friend's cart to dupe a pokemon to make sure this worked. And it did. Therefore this is freakin sweet. I wont have to pickup EQ's again EVER.
In other news (which is definitely related, for being an amazing glitch), thanks to the Transform/Rage glich in Generation IV, Slaking can learn Skill Swap (Unless the glitch works differently in his case). This opens so many frontiers of Destruction, it's not even funny....wait no, it is.
Evil laughter aside, it certainly is surprising that the one thing that could make Slaking too godly to exist has no posts here....
However, the possibilities are definitely worth noting here. Pop Truant on any opposing pokemon, and you force an automatic switch. Trap them first, and you're in for shmooth shailing with Focus Punch and Protect. If Swapking doesn't get banned, Ariados and other trap-passers will start seeing a lot of use.
Now all that's left to do is for good ole' Smogon to decide on how to deal with this game-breaker (although i may be speaking too soon).
Swapking needs a tier of his own.