Where to get rare candies Pokemon Platinum?

Answer 1

get a Pokemon with the pick-up ability

after every battle the Pokemon has the chance of holding an item which can be a rare candy

chances depend on the level of the Pokemon

level 1-20 : 0%

level 21-30 : 3%

level 31-40 : 5%

level 41-100 : 10%

note that (in case of a level 41 zigzagoon for instance) the chance to pick up an item is 10 % and the chance of that item being also 10%, so the chance for having a rare candy after every battle is 1%

have 6 Pokemon with the ability and that makes your chance for a rare candy 6% after every battle