I don't recall any language suggesting that Dumbledore worked on the Stone with Flamel, only that he worked on alchemy with Flamel (reported on his Chocolate Frog card). And I don't recally anything to suggest that Dumbledore ever had a Stone of his own, only Flamel's for safe keeping. In MoR, Dumbledore cites Flamel's expertise, not his own, for his conclusion that Voldemort couldn't create a Stone. In canon, Dumbledore reports that Flamel has destroyed his own stone, without saying anything about himself.
Well, all that may be true. It has been a very long time since I read Harry Potter and the Philosopher's Stone. (Although I could have sworn Dumbledore was implied to have been using the elixir, and this was one reason it wasn't surprising that he he died later on.)
- This thread has run its course. You will find newer threads in the discussion section.
Another discussion thread - the fourth - has reached the (arbitrary?) 500 comments threshold, so it's time for a new thread for Eliezer Yudkowsky's widely-praised Harry Potter fanfic.
Most of the paratext and fan-made resources are listed on Mr. LessWrong's author page. There is also AdeleneDawner's collection of most of the previously-published Author's Notes.
Older threads: one, two, three, four. By tag.
Newer threads are in the Discussion section, starting from Part 6.
Spoiler policy as suggested by Unnamed and approved by Eliezer, me, and at least three other upmodders:
It would also be quite sensible and welcome to continue the practice of declaring at the top of your post which chapters you are about to discuss, especially for newly-published ones, so that people who haven't yet seen them can stop reading in time.