You can't get a TM of it.
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yes, it dose learn focus punch in pokemon pearl.
There is no TM for thunder punch.
As you are about to enter Cerulean City, You will see 2 men standing in a clearing, facing each other. One of the men teaches a pokemon in your party "Dynamic Punch", the other teaches your pokemon "Dynamic Kick".
You can't. Only in the second generation (gold, silver, crystal) it's TM41. In Diamond and Pearl is their no Thunder Punch TM. You can learn Thunder Punch in Pokemon Platinum from the Move Tutor.
You can only teach it in Emerald with a move tutor sorry :(