Furious Master is a Pokémon trainer that you can battle any time you want. I'd advise against it though. Furious Master has Pokémon that far exceed normal limitations. The weakest of which being level 300, and the toughest of which being level 450. He also has some 5th generation Pokémon too.
His Pokémon: Spiritomb, lv 300, shiny. Heatran, lv 325, Dark Raquaza, lv 350, Metal Salamance, lv 375, N/A Reshiram, lv 400, N/A Zekrom, lv 450, N/A