the Pokemon that can use thief are ralts,lotad,mightyena and other dark and psyic Pokemon i cant think of.
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A keckleon in the wild already noes thief.
many Pokemon can learn thief. i taught it to my bronzong and magnezone
keceleon
dark Pokemon can on learn thief in firered
Kecleon and Mightyena learn it while leveling up. Almost every other Pokemon can be taught the TM thief.