It depends on which Pokemon it is because they
all have different evolving levels.
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Anorith Evolves into Armaldo at level 40. This is the same as every single fossil pokemon in every game
Yes, if a Pokemon was supposed to evolve at level 18 but you catch it at level 40 like a Pidgey, if you level it up again it will evolve, this will happen again every time you up its level if you press B during the evolvation.
Level20, As it always does in every other Pokemon Game.
Emolga does not evolve. I played Pokemon White also and it does not evolve. Some Pokemon do but this one does not evolve.
Yes, they will attempt to evolve every level afterwards until either they reach level 100 or you give them an everstone to hold.