Some pokemon evolve by level. Some pokemon evolve by happiness. And Some pokemon evolve by stones. However, there are some pokemon that evolve through more complex means. Eevee, for example, evolve into Espeon and Umbreon at Day and Night, respectively, and into Leafeon and Glaceon when leveled near a Moss and Ice Rock, respectively. However, because the Varaia region does not have the means for certain evolutions normally, the pokemon have found Alternative ways to evolve.
Pokemon that evolve when traded with a certain item do not need to be traded. Simply use the item directly on the pokemon. Examples include Milotic, Kingdra, and Scizor. The evolution of the Porygon family, however, was changed on VS due to the nature of their evolution items. See the list below.
Pokemon that evolve via happiness during a certain time of day will evolve regardless of time when wearing a Soothe Bell during level up.
Pokemon that evolve at a certain time of day while holding a certain item will evolve during level up with that item, regardless of time of day.
> Leaf Stone
> Shiny Stone
> Dawn Stone
> Dusk Stone
> Dusk Stone
> Evolves from Karrablast when touching Shelmet
> Evolves from Shelmet when touching Karrablast
> Evolves from Mantyke when touching a Remoraid
> Evolves from Kadabra at Level 30
> Evolves from Porygon at Level 16
> Evolves from Porygon 2 at level 36
> Evolves from Magmar at Level 45
> Evolves from Electabuzz at Level 45
> Evolves from Graveler at level 36
> Evolves from Boldore at level 36
> Evolves from Machoke at Level 37
> Evolves from Gurdurr at Level 37
> Evolves from Nosepass at Level 25
> Evolves from Magneton at Level 36
> Evolves from Wurmple at Level 10 when holding a Poison Barb
> Evolves from Wurmple at Level 10 when holding a Sharp beak
> Evolves from Tyrogue at Level 20 when holding a Lucky Punch
> Evolves from Tyrogue at level 20 when holding a Power Band
> Evolves from Tyrogue at Level 20 when holding a Black Belt