D19F is item 1 ID; set it to 01 for Master Balls. Then set D1A0 to FF for 255 of them. Set D19F (or D1A1) to 20 for Rare Candies, then D1A0 (or D1A2) to FF for 255 of them. I've attached a cheat list with these. Hope this helps!
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If you open the .CHT as text, they are already in Gameshark format. If you use BGB, though, you can load it directly.
Thank you! Gotta figure out how to make Gameshark codes from those since im not sure if SameBoy has a memory editor, and even if it does I have no idea how to use one :/