I would have a gym, which is always locked.
I would be the 8th gym leader, and you'd have to find me outside the Sinjoh Ruins, where we'd battle. However, it wouldn't be that easy, as to get to Sinjoh Ruins you have to head east on and incredibly long snow route with deep snowdrifts. And by long, I mean, Hoenn mainland-width long :D No pokemon center either. Hence my gym would be really, quite strong. And the Elite Four would be Johto Elite Four rematch standard :D
So, once you finally reached me, I'd point you in the direction of the cabin, tell you to go rest and come back.
We'd then have an epic 6 vs. 6 battle on the Mystri Stage. My team would be:
Lv.10
@ Focus Sash
Protect
Stealth Rock
@ Sitrus Berry
Lv.64
Technician
Agility
Baton Pass
Bullet Punch
U-Turn
@ Passho Berry
Lv.70
Solid Rock
Rock Wrecker
Earthquake
Thunderpunch
Brick Break
When Scizor passes to that, you're in trouble :D
Especially as with Sandstorm, Passho Berry and monstrous stats, the only thing that can touch it is Grass Knot, Frenzy Plant or Leaf Storm.
lv.65
Cloud Nine
Surf
Psychic
Focus Blast
Signal Beam
@ Petaya Berry
lv.62
Substitute
Sunny Day
Flamethrower
Solarbeam
Yeah, this'd be easier to kill than Hippopotas...
And finally, just to make things worse:
@ Expert Belt
lv.69
Dark Void
Thunderbolt
Dark Pulse
Calm Mind