"Gek!" Greninja felt that to help Ditto transform completely into its likeness, it needed to let Ditto know what its body was like. Only by understanding the body could Ditto transform into it better.
So they had to start by practicing the moves Greninja had learned.
First was its signature move, Water Shuriken. Ditto picked this up very quickly, becoming proficient at using Water Shuriken in just half an hour. As for the move's power, Greninja had never expected much in the first place. After all, Ditto's level was low.
Several hours later, Greninja discovered to its surprise that Ditto seemed able to use all the moves it had learned, with just one exception.
Mind Reader.
Ditto seemed unable to use this move no matter what, so the number of Water Shuriken it produced was completely random. It couldn't maintain a steady five like Greninja.
"Dit." Still in Greninja's form, Ditto panted and plopped down on the ground. It had just gone through every move Greninja knew in turn, and with its meager stamina, it had nearly exhausted itself.
Greninja thoughtfully gave it a Pokéblock. Ditto gobbled it down in a few bites and began slowly recovering its stamina.
Just then, however, Greninja's eyes suddenly lit up. It held both hands out and condensed a ball of water as smooth as a mirror.
"Gek!"
Quick, take a look at yourself!
"Dit?" Ditto curiously studied itself in the water ball and discovered that one of its eyes had completely changed into Greninja's red eye, while the other remained unchanged.
"Dit, dit!" Ditto jumped up excitedly. This was a major breakthrough for it!
"Gek!" Greninja smiled and patted its shoulder.
Keep working at it! You'll definitely manage to Transform!
They kept practicing until 4:00 in the night, when Ditto finally mastered the