Upon hearing Diantha's command, Seiya did not hesitate and directly transformed into Vaporeon.
After all, in front of others, he was currently Diantha's Pokémon. He had to give her some face.
Besides, he had already gotten a rough grasp of Ash-Greninja's strength. Even if it was a mistaken command, his experience and reflexes gave him plenty of room for error.
"Use Rain Dance!"
Watching Seiya transform from Jolteon into Vaporeon under Diantha's command before using the move "Rain Dance," Diantha, Ash, and even the spectators like Clemont all wore puzzled expressions.
Logically speaking, Jolteon should have held the Attribute advantage against Greninja.
Whether it was Ash or Clemont, neither of them could understand why Diantha had Seiya become the Water Attribute Vaporeon.
And while a move like "Rain Dance" could create terrain more favorable for Water Attribute Pokémon, one should not forget that Greninja was also a Water Attribute Pokémon.
As thick clouds blanketed the sky, a torrential downpour suddenly began. The sheer intensity of the rain and the range it covered made Clemont and the others marvel at just how powerful this "Rain Dance" move was.
To be honest, not only Ash and Clemont, but even Diantha, who was commanding Seiya in battle for the first time, was visibly stunned by the intensity of Seiya's "Rain Dance."
There were not many Pokémon that could use "Rain Dance," and most Pokémon could only make the ground damp at best with it.
Yet Seiya's "Rain Dance" in Vaporeon form had directly created a small lake on the battlefield out of thin air!
In fact, if he had not been mindful of Diantha, Ash, and the others as Trainers, his "Rain Dance" could have been even stronger.
Because of the water covering the field, Greninja, having entered its Bond Phenomenon form, became