Remember, Birth by Sleep is a pre-sequel to Kingdom Hearts I. The secret movie at the end of Kingdom Hearts II is part of the opening and ending cut scenes of Birth by Sleep. Terra gave Riku the ability to wield a Keyblade, but as Riku grew older, he chose darkness over light and the Keyblade chose Sora instead as Riku's body was possessed by Ansem.
You can find the ending at Youtube.com.Just search in "kingdom hearts 3 secret ending".There you go!:)
If you mean the secret movie, you need to get 100% on your journal before defeating Xemnas in the final battle.
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"Reconnect" is not actually a new Kingdom Hearts game. It's the name of the secret ending in Re:Coded.
The secret boss of Neverland is called 'Phantom'.
They are in Agrabah and Neverland (Clocktower)
Not that I know of
Yes there is a secret. once you've found all the dalmation puppies you unlock a secret ending.
Kingdom hearts II final mix is an extended Japanese version of Kingdom hearts II with more bosses including Terra from birth by sleep and a bonus secret ending.
No because kingdom hearts 3 is related to kingdom hearts birth by sleep but Ventus lost his heart in Ventus's secret ending when Ventus gave Sora his heart, Aqua put Ventus into this dome like where Roxas found Sora in it in kingdom hearts 2. Aqua bilt that to make Ventus heal in Aqua's secret ending.
Kingdom Hearts was created to hold hearts of light and darkness so that a new world can be created, and whoever gets the hearts, designs the world. (As said in the secret reports in Kingdom Hearts Birth by Sleep)
Essentially, Kingdom Hearts II is the same as Kingdom Hearts II Final Mix +. Final mix has a secret ending, new battles, a new difficulty setting, and additonal items (all based on the Manga). It's a two-disk game; Kingdom Hearts II Final Mix and Chain of Memories.