This doesn't happen in Wi-Fi, Random Battles, or Union Room (aka local wireless) battles.
First off, remember that auto-leveling is possible, depending on if you're doing Wi-fi or Local Wireless battling. So if they auto-level to 50 or 100, you won't have a level 1 Smeargle.
That being said, you're trying to pull off Sleep, Endeavor to 1 HP, and Trick Room. That's too much and is essentially wasint a move slot.
If you want to Endeavor your opponent down to 1 HP, you want to at least also have a priority move. Quick Attack, Bullet Punch or Aqua Jet all get the job done.
There's two move slots right there, Endeavor and whatever priority move you want.
What will likely happen is after you Endeavor your opponent down to 1 HP, your opponent will probably realize what you're trying to do and switch. You've got a couple options.
You can set up entry hazards such as Stealth Rock, Spikes, or Toxic Spikes. You can Taunt to stop your opponent from setting up entry hazards. You can boost stats and attempt to Baton Pass. And you can switch.
I think Smeargle's best bet is to set up Stealth Rock and, if it gets the chance, to use Taunt.
So Smeargle w/ Focus Sash
Jolly
Own Tempo
252 atk/252 speed/6 HP
-Endeavor
- Quick Attack
- Stealth Rock
- Taunt
Word of warning. This whole Endeavor/Quick Attack strategy is a fairly well known strategy. People WILL see this coming. But if you catch them off guard, it can pay off big.
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Rest is just letting your opponent switch out to get your stat boosted Snorlax to be Whirlwinded or Roared away, or knocked out with a Fighting move.
Body Slam/Fire Punch has a pretty bad coverage. I think Thunderpunch helps you take out Gyarados and Earthquake hels you take on Heatran. You're still kind of vulnerable to Dragons, but STAB Body Slam hurts quite a bit and has that handy paralysis.
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Okay, about Hidden Power.
Hidden Power is ONLY effective for those it hits for x4 super effective damage. A standard STAB BoltBeam type move is just about or even stronger when it hits for neutral damage than a Super Effective x2 HP does.
STAB Surf/Flamethrower/IceBeam/Thunderbolt for neutral damage: 142
Hidden Power Whatever for x2 damage at base 70 power: 140
Hidden Power Whatever for x4 damage at base 70 power: 280
So what is Porygon-Z hitting for x4 damage? Are these really that big of threats? The only thing it really hits is Tyranitar, and Tyranitar's Sp Def is ridiculous anyway. Might not be worth the moveslot.
Magnezone w/ Magnet Pull is possibly the best Scizor counter, but your current set kind of sucks.
Substitute or Toxic/Thunderbolt/HP Fire/Thunderwave is your new set. This easily takes down Forretress and Scizor (watch out for Superpower). Heracross will be a bad matchup for Skarmory (though Skarmory hates STAB Close Combat)....and, well , Heatran is a problem to your team, no doubt about that. Maybe fit Aura Sphere on Togekiss, maybe ditching Encore.
Mono tourneys are more for fun than straight up competition anyway since you'll always have a weak spot or two.
Best of luck.