If you mean strength you can find that in iron island talk to the guy with the blue hat and he will give you strength
if you mean something else i don't know
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iron island
where in the solacon ruins i can not find it
You have to have the HM Strength which you can find on Iron Island with Riley.
You are not able to buy the TM for the move Thief in Pokemon Platinum. You can find the TM for Thief in Eterna City. The move Thief isn't use often competitively and it doesn't matter which Pokemon can use it for it to steal held items.
you get it from the elder in celestic town after you defeat Cyrus in the shrine