Leech is the book version of physician. Also, leech is a carnivorous or bloodsucking aquatic worm. Chillingworth seem to "suck" the power out of Reverend Dimmesdale. That's the main connection and the double-meaning.
References :<http://thesaurus.com/browse/leech>
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you cant get leech seed in Pokemon platinum, Pokemon can learn leech seed by lvl, like torterra and Roselia
The letters spell the word leech.
powerwhip wring out crunch and leech seed
Depends on your tactic. If you ask me, I think that Torterra can benefit from better moves but if you use Substitute in your strategy or Woodhammer then Leech Seed can be a very good move to use.
Crobat learns wing attack and leech life . That is all I know .