Teemo has a few attributes that scale well with support

Compared to other supports, Teemo is better at:
- scaling DPS
- vision control (shrooms last 300s)
- countersieging
- providing easy to land CC vs auto attackers

Teemo is generally worse at
- consistently winning lane
- surviving (not getting caught)
- providing heavy CC
- keeping specific teammates alive

Misc Tips
- Use a shroom for baron/drag vision so you can ward more aggressively
- Spread out shrooms - a shroom at the entrance to their jg can cause them to waste scan and not have it for river/deep jg
- You can place a ward in their site to bate out a scan away from shroom fields
- Shroom high traffic places for champs but low traffic for minions. Prioritize the 4 corners of midlane, entrances to jg, and neutral objectives.
- Exception: place 1 shroom in front vulnerable turrets, a second shroom further out is also fine
- Never sit at 3/3-5/5 shrooms. keep 1-3 available for mid fight, especially since fights can happen at unexepected places. when CD timers are long, never die with shrooms available
- Leave fights when your abilities are on CD; you cannot tank and have minimal auto DPS
- Reset often for wards, you should aim keep 3/3 ward uptime while also having spares available
- Buy control wards only after malignance. They are expensive, and shrooms > wards much of the time. You are not the best at defending wards
- Be well-mannered, positive, and supportive. Especially below emerald, your teammates are looking for any reason to blame Teemo sup for anything and everything. Don't engage with trolls or negative folks. Just mute and move on.
- Let your teammates get solo plates and kills when it makes sense but don't force it. Failng to secure plates, to secure kills, and to convert solo kills into assisted kills deny's your team gold.