If you mean flareon, then i will tell you. Flareon does not evolve. It evolves using a fire stone and it can't evolve after that.
level 31
It does not evolve at a certain level. It evolves when you use a Fire Stone on it.
Lvl 20.
mine evolved at lvl. 31
beet the league,get the national pokedex get full friendship then evolve it one level
Personally i would say as soon as you get gloom evolve it.
Sandshrew evolves at level 22 in both fire red and leaf green. But in order to get sandshrew on fire red version, you have to trade it
AT level 50 this is a good website for all Pokemon and what they evolve into http://bulbapedia.bulbagarden.net/wiki/List_of_Pok%C3%A9mon_by_evolution_family
Level the Pokemon you want up to a specific level, or link trade it with another player and it may evolve. Don't forget to get it back though!!!
it evolve at level 40
Duskull will evolve at Level 37 in Red Rescue Team.
Yes, Drowzee does evolve in Pokémon Red.