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Battle Tower is the only way to clone a Pokemon / Item in Emerald as far as I know. You could use a cheat device like Action Replay or Game Shark to clone.
Yes I agree with clade. I dont think any other known way is discovered yet. I guess there could be another way discovered but at the moment I doubt it. Sorry.
well i thinks there's another way..but i think that is a stupid idea...my friend told me that he cloned a pokemon on a rival's pc but i don't think it's a good idea...and until now i haven't tried that out...