Tell him you're actually a human.

"H-huh!?" Jason seems taken aback as you tell him what you really are. "You say you're a human? But you look like a totally normal Vulpix to me!"

You try to prove your humanity by telling him something about your life before this... but you can't seem to remember anything.

"You're... a little odd..." Jason looks at you like you told him you came from the moon or something. "Are you pulling some kind of prank on me?"

"I'm telling the truth!" you insist. "I just... can't remember anything..."

"Hm... Well, you don't seem to be a bad Pokémon, at least. Or bad human, I guess..." Jason says, still not entirely convinced but willing to trust you anyways. "S-sorry for doubting you. Many Pokémon have gotten agressive lately. There's a lot of theft, kidnapping, rape... things have grown somewhat lawless..."