4 HP / 252 SpA / 252 Spe
~ Ice Punch
~ Giga Drain
~ Fire Punch
This would also work in-game perfectly. Unless you have R/S because Ice and Fire Punch are only available via move tutors in Emerald. You could replace both moves with Shadow Ball and Hypnosis if that is the case.
Shadow ball is physical in r/s/e I believe Psychic is an option but it gets redundant coverage, you could find out what its hidden power is :L night shade I think it might get explosion I'm not sure Dark is also special but I dont know what dark moves he gets poison is physical so sludge bomb is out of the question options are limited really :/