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.
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I'm fairly certain that if you go to the department store and try buying TMs, you can buy thief, then teach it to most dark or ghost type Pokemon.
Yes you can buy the Focus Blast TM move in Pokémon Platinum.
You can not get PP ups in Pokemon platinum.
It depend what game you have. In Pokemon Ruby you can buy the move in Lilicove City(same with Emerald and Sapphire ) In Diamond you buy the move in Veilstone City.(same with Pearl and Platinum) After you get the move just press A and then select use. Then choose which Pokemon you want to learn. Or want till gets to a certain lvl
no