Telepathy explanation

(Family Reunion, Chapter 6)

“Well, I have a question,” Latoshi said, boisterously. “Why the heck can the three of us understand what Fireball and Bubbles say?”

“Another very good question,” Serenity answered. “Pokémon instincts are more naturally in tuned with the spirit than humans. That's why all Pokémon are able to sense spirit energy, while very few humans can do the same. The bond between humans and Pokémon can run deep enough to the spirit. Since Antoshi possesses spirit awareness, he can 'hear' what Fireball is projecting with his spirit through spoken words. The same goes for Mitoshi and her Lapras. As for why the other two siblings can hear them, too, I believe it's because of your familial bond. Your spirits are deeply attuned to one another by birthright.” Latoshi was visibly impressed by the explanation.