It’s been a few days and the meta has mostly settled down now. Now while there are a ton of different trick room attackers that are all viable I'm just going to list the top 3. Keep in mind though that anything with a good attack stat, bad speed and solid move choices can work as a trick room sweeper. Anyway to the answer.
1. Mawile
Mawile is probably the best mega trick room sweeper. A bad speed stat high attack stat and the best type in the game are all things in its favor. It also gets intimidate as it’s pre mega ability which is nice as well.
2. Torcoal
Torcoal hits super hard with spread eruption. Even more so if you give it a helping hand boost. It also gives you a nice form of wether control which is a great bonus.
3. Kingambit
This thing isn’t particularly a trick room sweeper but it’s still real good with trick room. Defiant keeps Incin away allowing you to get as much as possible out of your trick room turns. It also hits really hard with Kowtow cleave and after trick room expires it can finish games off with sucker punch.
Besides these 3 some honorable mentions include Blastoise, Crabominable, Sylveon and Sinitcha.