USED IN VIRIDIAN FOREST:

Glaceon
Pikachu
Alakazam
Umbreon
Smoochum
Diglett
Abra
Gardevoir
Lucario
Mudkip
Squirtle
Vileplume
Ditto
Bidoof
Zoroark
Ambipom
Ninetales
Starmie

USED IN NEW MOON ISLAND:

Feraligatr
Togepi
Absol
Charmander
Munchlax
Azurill
Snover
Flareon
Sharpedo
Shinx
Remoraid
Eevee
Politoed
Skitty
Pachirisu
Rhydon
Cubone
Blastoise

USED IN HOENN SAFARI:

Weavile
Jirachi
Mew
Blissey
Turtwig
Torchic
Bonsly
Altaria
Espeon
Lickilicky
Luxray
Gloom
Riolu
Cinccino
Ralts
Deoxys
Pichu
Electabuzz
Blaziken
Lapras

USED IN STEAM CAVE:

Plusle
Snorlax
Blitzle
Charizard
Vanilluxe
Machamp
Jigglypuff
Braviary
Teddiursa
Torkoal
Sawsbuck
Krookodile
Articuno
Grovyle
Sylveon

USED IN WHIRL ISLANDS:

Ampharos
Rapidash
Roselia
Mime Jr.
Magikarp
Sableye
Honchkrow
Swellow
Fennekin
Typhlosion

RESERVED FOR SANTALUNE FOREST:
The following Pokemon are excluded from Santalune Forest only. If a username is listed, that person has reserved the Pokemon.

Bulbasaur (reserved by SurvivorRulz96)
Celebi (reserved by JakeB)
Dragonite (reserved by jtotalturtle)
Darkrai (reserved by TheEclipse)
Girafarig (reserved by Giraffez)
Ho-Oh (reserved by Avatar20)
Hoppip (reserved by bigdizzleyomama)
Joltik (reserved by Squirrels1666)
Lopunny (reserved by AlanDuncan)
Manaphy (reserved by Guigi)
Mightyena (reserved by 01Gohan)
Milotic (reserved by LoyalLestrange)
Piplup (reserved by blatastic1234)
Sceptile (reserved by FunkyBike1)
Sneasel (reserved by timerondo)
Tepig (reserved by bigwerdz)

Spritzee (reserved for use in later seasons)
Aromatisse (reserved for use in later seasons)
Swirlix (reserved for use in later seasons)
Slurpuff (reserved for use in later seasons)
Generation VI event legendaries (not yet distributed)