To beat:

Roxxane-Marshtomp,Wingull
Brawly-Swampert
Wattson-Swampert(Mud shot or muddy water)
Flannery-Swampert and a water pokemon
Norman-Machop or Machoke and Blaziken
Winona-Swampert a Shellgon if u have and a rock type
Liza&Tate-Swampert And some lv 50 water pokemon
Wallace-Sceptile,Swampert and Blaziken w/Groudon
Pkmn League-3starters but They should be at Lv80 or higher,Groudon,Salamence or Flygon
Champ-same as the pokemon above