Found some stuff in 2ch, of course if DecaEnd is here I hope he can confirm this for me since he knows Japanese.
仮面ライダーバース リボーン(バース最終形態。)
セルから新コアメダルに変換するメダル変換機 メダリボーン使用
仮面ライダーオーズ タトバリングコンボ
メダリングスキャリバー使用
仮面ライダーアンク
始祖鳥
translation:
Kamen Rider Birth Reborn mode (Final form of OOO)
- uses a Medaribon to convert medals (Cell to core, or the other way round, not sure...)
Kamen Rider OOO TaToBaringu Combo
- uses Medaringusukyariba
Kamen Rider Ankh
- some kind of bird:Archaeopteryx
Also, from a blog there's some info saying why TaToBa is a Combo and about TaToBaringu.
Why Tatoba Combo?
Tatoba is the living things born before GREED.
They are the 'ancestors' of Bird, Insect and Cat family species.
To defeat and handle the GREED, the inventor or creator of OOO found out the advantages ability and skills of Tatoba. They want to make reform Tatoba by using core medals.
Because of OOO is used by human, the true ability cannot be shown.
Why TaToBaringu Combo?
After many times of fail experiment on Tatoba, the creator found out that Batta and human are not adaptive.Therefore they used Baringu (Living things that were born at the same time with GREED) to form Combo.
Finally, OOO that can fight with the ancient living things is BORN!!
http://minenosekai.blogspot.com/2011/02/rumors-and-spoiler-discussion-on-why.html Please don't believe everything now, this is my rough translation, we need experts on japanese pls.