User blog:Zeref Fullbuster/Gym Leaders, Champions, Frontier Brains and Legendary Pokemon

I'm curious about the Pokemon World Tournaments: The Battle Between Legendary Pokémon where gym leaders use Legendary Pokémon like Sabrina with Mewtwo, Falkner with Lugia, Winona with Rayquaza and Fantina with Giratina. Which makes me wonder what other gym leaders or Champions (not counting those who use -type Pokémon) can use Legendary Pokémon native to their Region which are normally illegal in competitive battles or tournaments?