Come to think of it, usually each league is won by a trainer with a unique pokemon/team of pokemon (with Kanto league being an exception)
Johto had Harrison and his totally new pokemon Blaziken.
Hoenn had Tyson and his "Meowth in Boots".
Sinnoh had your favourite Tobias guy and his Darkrai/Latios.
Unova had Virgil with his unique Eeveelution Team.

So now you want to see Tobias 2.0 for Kalos League? He's right there, it's Ash and his Ash-Geninja.