That's because the point of view is from Touko. In Pokémon Black, the protagonist would normally get Reshiram, who is the embodiment of Truths. Presumably, if the story was told from N's point of view or the White version variant, the words "ideals" would be used interchangeably with "world".
You were living in those legends... And you treated me as if I were a real hero.Who was telling the truth? The Pokémon hurt by human hands, or the happy Pokémon?They were both telling truth.That was what you couldn't accept.You made me become part of the truth you were living in, and you fought me as a hero trying to make sure who was in the right.That was your dream...
That was the ideal world they taught you to believe in...That's why I tried to make you hear the voices of my Pokémon.After that, you kept going to find more people who lived with Pokémon, and you kept looking for your truth.Founding the country Unova watched over by a legendary Pokémon, being the hero of the Second Coming, liberating Pokémon, and separating Pokémon and humans...The happy voices of Pokémon...
You used to live with hurt Pokémon, so you never heard those other voices,