well the only way i know of is to try find a lot of them or you could get some Pokemon with the pick up ability and put them in your party and battle someone or something
You can get three rare candies in Pokemon ruby sapphire and emerald
There are five Rare Candies.
by using a specific gameshark code that enables you to get 99 rare candies on ruby.
you have to buy actionreplay and get lots of rare candies
Give it rare candies, lots and lots of rare candies.
use the itemfinder
It is not possible to legitimately get infinite rare candies in Pokémon Ruby. To do such a thing you would have to use Action Replay.
you can't without hacking
You cannot get infinite rare candies without hacking and cheating. There is a set number of rare candies available in the game. The only way to get infinite rare candies is to hack and cheat.
use the missingo cheat
Use an action replay
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