I simply cannot beat this tourney.I've gotten as far as round 6 and then I lose.I'm usin my GB pokemon(I have quite a lot)and I usually use a diff team every time.Here are all the ones eligiable for the Tourney:
Magmar L.51
Aerodactyl Lv.52
Pinsir L.52
Marowak L.52
Kabutops L.51
Porygon L.52
Gengar L.52
Snorlax L.51
Victreebel L.51
Raichu L.51
Ninetales L.52
Nidoking L.52
Venomoth L.51
Electrode L.52
Venusaur L.51
Hypno L.51
Exeggutor L.51
Hitmonlee L.52
Golduck L.52
Omastar L.51
Gyarados L.52
Lapras L.51
Arcanine L.51

who should I use?I'll post movesets if u want,this would be way too long if I did it on this post

I'll keep that in mind,Jolt.

Here are the movesets:

Snorlax:Body Slam,Amnesia,Double-Edge,Selfdestruct
Ninetales:Flamethrower,Swift,Quick Attack,Confuse Ray
Nidoking:Seismic Toss,Earthquake,Thrash,Horn Drill
Electrode:Explosion,Light Screen,Flash,Thunder
Hypno:Headbutt,Poison Gas,Disable,Psychic
Gyarados:Hydro Pump,Hyper Beam,Surf,Dragon Rage

They're not exactly groundbreaking,but these are from a couple years ago,when I didn't know about movesets and stuff,thats why I have moves like Horn Drill,Thunder,Hydro Pump,etc.