Types of evolution

There are a few way Pokemon evolves. Below are all the known way for
Pokemon to evolve

- Level Evolution
- Stone Evolution
- Day & Night Evolution
- Trade evolution
- Trade+Items evolution
- Beauty Evolution
- Happiness Evolution
- Stats Evolution
- Empty Slot evolution (Shedinja)

Level Evolution
A straigtforward evolution, Pokemon evolve after it reaches certain
level.
example: the starters

Stone Evolution
By using stone such as Fire Stone, certain Pokemon like Vulpix will
evolve. The downside to this kind of evolution, is that Pokemon will
unable to learn anymore new moves naturraly. Of course, there are
exception such as the Eevolution.
example: Lombre, Nuzleaf

List of Pokemon evolved by stones:


Pikachu -> Raichu - Thunder Stone
Nidorina -> Nidoqueen - Moon Stone
Nidorino -> Nidoking - Moon Stone
Clefairy -> Clefable - Moon Stone
Vulpix -> Ninetales - Fire Stone
Jigglypuff ->Wigglytuff - Moon Stone
Gloom -> Vileplume - Leaf Stone
Gloom -> Bellosom -> Sun Stone
Growlithe -> Arcanine - Fire Stone
Poliwhirl -> Poliwrath - Water Stone
Weepinbell -> Victrebell - Leaf Stone
Shellder -> Cloyster - Water Stone
Exeggcute -> Exeggcutor - Leaf Stone
Staryu -> Starmie - Water Stone
Eevee -> Vaporeon - Water Stone
Eevee -> Jolteon - Thunder Stone
Eevee -> Flareon - Fire Stone
Lombre -> Ludicolo - Water Stone
Nuzleaf -> Shiftry - Leaf Stone
Skitty -> Delcatty - Moon Stone

Day and Night Evolution
Pokemon with this kind of evolution, evolve differently depending on
the time of the day.
Example: Wurmple

Trade Evolution
When a Pokemon is traded, it will automatically evolve.
example: Graveler, Kadabra

Trade+Items evolution
Pokemon will evolve if it taded while equipped with an item such as
King Rock
Example: Huntail, Gorebyss

Beauty Evolution
Pokemon will evolve after its beauty stats reaches a certain point.
This evolution only apply to Feebass
example: Feebass

Happiness Evolution
Each Pokemon, have its happiness point which indicate how loyal is
that Pokemon to its trainer. Once a Pokemon accumulate a certain
happiness point, they will evolve.
Example: Crobat

Stats Evolution
Stats Evolution
Pokemon will evolve differently depending on stats. The best example
would be Tyrouge. It evolves differently depending its attack and
defense stats to either Hitmonchan, Hitmonlee or Hitmontop.
Example: Tyrouge

Empty Slot evolution
You will get a new Pokemon, if you have 5 or less Pokemon in your
team. This evolution is only exclusive to Nincada->Ninjask+Shedinja
Example: Shedinja