Eevee has like nine evolutions and some are only with stones like fire or water stone and some are with daytime or nighttime or even just happiness. Eevee is 1 of the weirdest Pokemon ever...
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You need to make Eevee love you, and then you evolve it at night.
It evolves at level 42. It evolves into glalie.
You have to use a dusk stone on it and you will get a chandelure
In Pokemon Diamond, Pearl, and Platinum, if you want to evolve your Evee to a Leafeon you go to the Eterna Forest You will have to level up your Evee there and once it levels up by one level, it evolves to a Leafeon. If you want a Glaceon, you level up eevee on route 217. To get a Flareon, you give Evee a Fire stone. For Vaporeon, you give it a Water stone. And for a Jolteon, you need a Thunder stone.
Tentacruel doesn't evolve, it is the final form of that pokemon. If you mean what level does Tentacool evole it is level 30.