Level 20
Level 20.
Level 20 is when it evolves.
raticate
Yes, you can. If you have a starter pokemon you will have to wait until it's about level 16-18 for it to evolve on its own. Pikachu, vulpix and poliwag have to have stones used on them, which can be bought in the pokemart for $10,000 each. Don't evolve them with stones until they're about level 20 so that they can learn good moves. rattatta evolves at around level 20-22. I haven't tried geodude-graveler yet but I'm sure it'll work. the bugs evolve too, but don't catch cacoons, because they're worthless. If you evolve a basic bug into a cacoon, it'll still keep its attacks, so that's better. The bugs will reach their final stage by level 12, so you'll just have to be patient.
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.
They evolve at level 36
It will evolve at level 36.
They evolve on level 40
it evolve on level on 64
if you dont let it evolve at the required level of level 20. itll try to evolve at every level following.
To evolve a Sandshrew level it up to Level 22 and it will evolve into Sandslash.