i think at level 32
If you mean Swallow as the move, it is not a TM. These Pokemon can learn Swallow by leveling up: Ekans, Arbok, Pelipper, Mawile, Gulpin, Swalot, Lileep, and Cradily. If you mean the Pokemon Swellow, you can find it in the wild at Route 115 or level up Tailow to level 22 to evolve it.
The Pokemon Swellow cannot evolve.
It doesn't. Did you misspell it?
30-32
It is suppose to evolve at the Level of 20,but if you want it to evolve later it can evolve anything after it is at Level 20.
It will evolve by level. Teddiursa will evolve into a Ursaring at level 30.
It will evolve at level 36.
it evolve on level on 64
They evolve on level 40
They evolve at level 36
if you dont let it evolve at the required level of level 20. itll try to evolve at every level following.