Scizor can be obtained at level 1. Just get level 1 Scyther and trade it holding a Metal Coat.
That is just one example. What are the rest?
If there were any events that gave out fully-evolved level 1 Pokemon, put that too.
Note that if you breed, for example two Snorlax without Lax Incense the hatched baby would be Snorlax, full evolution instead of Munchlax.
Note: Blissey won't count because you need to level up Chansey with high friendship meaning you can't obtain it at Level 1.
Hope this helps! Comment if anything missing.
There are many Pokemon that can evolve at lv.1
This is the list :)
I think these are all the Pokemon although I might have skipped a few but I doubt that