yes it learns it at about lv. 23 and you dont need a TM.
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you cant get leech seed in Pokemon platinum, Pokemon can learn leech seed by lvl, like torterra and Roselia
It doesn't learn Earthquake through level up, but it can learn it through the use of the Earthquake TM.
In Pokemon Diamond and Pearl you will have to go to route 228 and talk to an old man, I think you might have to do the same in Platinum.
Torterra can learn Leaf Storm at level 57.