Jolteon

Yellow quadruped with soft fur and sometimes something electric
For his species he is of normal size but the trainer sees him as a giant now

playful
Friendly and somewhat energetic, he doesn't get tired easily and with the size of his master it will now be more difficult to exhaust him.
and sometimes distracted with different things

He likes his coach and will always listen to him in almost everything
He likes his toys that he has
He doesn't like that his coach is now small but he doesn't care as long as he's okay
He doesn't like being alone