Grand Cetus

Grand Ketos are Wells and Sophie's Beyblades. The beast inside of it is a whale.

Beyblade: Metal Masters
It was first seen in episode 16, where Sophie used the white version to clear away water so she could view a sunken ship. Later, Wells used the blue version to beat a challenger in three seconds. Gan Gan Galaxy then spied on the "Festival of Warriors"-- a European tournament to select Europe's representatives, when they were discovered. Both of the Ketos were used in the following battle, which they won.

In episode 24, they battled Poison Virgo and Hyper Aquario. They seemed to be overpowered for most of the match, until they unleashed Grand Deucalion and defated Virgo and Aquario.

Special Moves

 * Grand Maelstrom(White): Ketos creates A whirlpool that knocks down its opponent.
 * Grand Fleet(Blue): 
 * Grand Deucalion: A combination attack where both Ketos send a tidal wave crashing down on their opponents.

Game
It was released in Wave 5. It is be a Defense Type. There are two variations, Blue and White.

Trivia

 * The one used in the "Aqua Sword Strike" set is a recolored Blue version, or Wells' bey.