Yamato gains of Zooman Power Whale.
Yamato uses the Whale Change Gun which he had received from the Whale's Zooman named Ketas. Whale Change Gunt transforms Yamato into Zyuoh Whale. Based on the suit & pose (his legs represents the tail of whale) it looks like he going use Kung-fu based attacks.
In the ancient period, Zooman used to live peacefully in the Human World. Ketas the Zooman of Whale was one of them. Earth gave him the Whale Change Gun which he had used to become the First Zyuoh Whale (This means that Yamato is the Second Zyuoh Whale).
Zyuoh Whale's Henshin Item & Weapon is Whale Change Gun. It's finisher is called as Zyuoh Final.
Zyuoh Whale's Cube Animal is Cube Whale which transform into Do-Dekai-Oh. Do-Dekai is Japanese for "Pretty Big". Seriously, Toei Producer are losing the Naming sense too.
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