My logic says that if Sidious is the strongest Sith ever, than Luke would be the strongest Forceable ever.
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No but he has some impressive feats with it.
I'll PM you a link with feats.
Othe rnotables:
-Emperor Palpatine who can conjure hyperspace wormholes at will to destroy spacefleets or transport people through the Galaxy,
-Darth Nihilus who can kill everything on a planet quickly
-Marka Ragnos who is just Badass.
And maybe more.
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In terms of strength in the Force, Anakin Skywalker. On a lower tier, Luke Skywalker (arguably, a great deal of the Skywalkers). On a lower tier than that, we have the likes Palpatine, Kyp Durron, Yoda, Bane, Zannah, et cetera.
Ferus Olin is also a contender, being regarded as the second most gifted padawan other than Anakin.
I assumed you knew about the Russian site that posts the novels online for people to read/download ,though it takes a while for them to get the new books up, I'd say it is better than trying to sneak into the kid's section any day for a book that well,doesn't have the same significance as the legacy of the force books.