Nothing. An everstone is just a hold item to stop the Pokemon from evolving.
An everstone is used to prevent evolution
Lombre is one of the pokemon that do not evolve by level he evolves by using a water stone.
There are two in granite cave one by going up the steps on the first floor and another by using a mach bike to fully explore the cave.
The Pokemon that evolve using a water stone: Eevee Starmie Lombre Poliwhirl, too...
It depends on the Pokemon. Some of them you have to evolve by using stones. Others don't evolve at all. There is not one level that all Pokemon evolve at(unless you use an everstone on them until level 99, then level it up once more to level 100, but that would be a waste of time).
An everstone is used to prevent evolution
yes you can.
You can evolve a Pokemon after using an Everstone. A Pokemon will only stop evolving while it is holding a Everstone. When the Pokemon is no longer holding a Everstone it will continue to evolve as usual.
Pikachu can evolve into a Raichu.
you need to trade and then it will evolve.
yes it evolves by using emerald stone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
Nuzleaf (evolve from Seedot at lv16) and Gloom (evolve from Oddish at lv22)
Pikachu evolves by using a thunderstone, so technically he can evolve at any level.
you can find it by using dive in route 124 and 126
pikachu
It evolves into Huntail.
Lombre is one of the pokemon that do not evolve by level he evolves by using a water stone.