I've heard from someone that it was possible to have King Mickey's summon (I'm not talking about when he saves you!), the thing is that you must have the Jornal 100% and the Gummy Ship mission 100% as well... then in the black and white world a new door will appear...

I haven't heard that rumor... but I doubt it's true. XD

I'm not saying that this is true, but it's just a rumor I heard.
"Yes you have to complete mainly everything in the game(Some people had to beat Sephiroth depending on there serial code for the game) and go back to Timeless river and there should be a door. You will have to fight a few heartless there and he will give you king's charm."

Haven't tryed it myself though.

hm..first I've heard of this.

It's a bit odd to decide whether you have to beat Sephiroth or not based on serial code of the game? Sounds a tad farfetched, but could be true.

This is probobly only bull****. Reminds me somehow of the rumor in FFVII which said you could get an underwater chocobo. By mating two gold chocobos and give em some strange nut.

I've never heard this...I doubt it's true. Someone would have done it by now and told the world.

I can tell you all that this rumor is not true for me. I completed everything. Including the Hunter X ship in the 3rd misson of Assault of the Dreadnaught gummi ship mission, and completed the entire journal (not a whole lot of fun, I might add),and all the gummi ship missions. I didn't find any door at timeless river for me. Think I missed anything?

I know for a fact that there is a randomizer codec, which is also used in area codecs which vary for countries.
But that is just a rumor for Kingdom Hearts, no such item exists or an summon *has checked with SQEX Staff again*, the only thing obtained by fully completing sections is the "Secret Ending" scene just like in Kingdom Hearts itself.

It probably isn't true. People get a kick out of making up stuff like this, I wonder why.

this is common amongst final fantasy games as well, but i always wonder who starts the rumors

Probably someone with nothing to do but just annoy people with some bull rumors.