The Guide made a small mistake...

[McLovin']

If you look at the KH2 Official Strategy Guide-->Synthesize Items Section--Lightning Gem/Crystal

You'll see that the monsters that they say drop Lightning Crystals actually drop Lightning Gems and vice versa.

Found it on accident.

[Tavrobel]

This was already established when the game came out. Giga Guess made a thread about it also, I think. I also caught this error when I first got the game on my first day, and was kind enough to point out the error in my frontsite Synthesis guide (which will be up on the frontsite soon).

The proper item drops are also listed correctly in the Bestiary.

Also, if you noticed, that the Recipe that is listed for the Elixir is the Mega Recipe, instead of the Star Recipe, in the items section.

There are probably more errors, but who is going to catch them all?

I will.

[McLovin']

Lol to you.