Yes threre is a way, you can catch a couple of meowths and they might pick up rare candies. You can also trade to Emerald and copy them.
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Rare candies suck they don't increase your stats as if you trained it fairly... You'd basically be useless against any serious competition.
Well i've never played pokemon vortex but i'm pretty sure it's the same as any online pokemon rpg game so just get a bunch of rare candies once your pokemon reaches lv100 use the rare candies on them to level them up some more.
The same way you would level up any other Pokemon - put it into battle with other Pokemon, or use Rare Candies on it.
you can multiply any rare item eg. experience share, rare candies ect. for multiplying them you should find 2 dittos give 1 of them the rare item put in the day care and when they give a egg and you break it the baby ditto will have the rare item this is how you can multiply rare items
When I finished the entire game, I ended with about 15. That is from finding them in pokeballs and through using item searcher. There are other ways to obtain rare candies as well too but just not as often.