From Bulbapedia, the community-driven Pokémon encyclopedia.

Friend Areas are places where players can store recruited wild Pokémon in Pokémon Mystery Dungeon. There are just enough Friend Areas to have space for one of every 386 Pokémon from the first three generations. Some Friend Areas can be earned by completing certain missions, while others must be bought in Pokémon Square from Wigglytuff.

Friend Areas List

• Plains
  • Beau Plains - Bulbasaur, Ivysaur, Venusaur, Chikorita, Bayleef, Meganium, Hoppip, Skiploom, Jumpluff, Taillow, Swellow, Roselia
    
  • Sky Blue Plains - Jigglypuff, Wigglytuff, Lickitung, Chansey, Igglybuff, Girafarig, Snubbull, Granbull, Smeargle, Blissey, Ralts, Kirlia, Gardevoir
    
  • Sacred Field - Raikou, Entei, Suicune

• Pond
  • Turtleshell Pond - Squirtle, Wartortle, Blastoise, Psyduck, Golduck, Marill, Azumarill, Azurill, Corphish, Crawdaunt

• Western Forest
  • Mushroom Forest - Paras, Parasect, Seedot, Nuzleaf, Shiftry, Shroomish, Breloom
  • Healing Forest - Celebi
  • Transform Forest - Eevee, Vaporeon, Jolteon, Flareon, Espeon, Umbreon
  • Secretive Forest - Venonat, Venomoth, Spinarak, Ariados, Pineco, Forretress, Nincada, Ninjask, Shedinja

• Volcano
  • Scorched Plains - Growlithe, Arcanine, Ponyta, Rapidash, Cyndaquil, Quilava, Typhlosion, Torchic, Combusken, Blaziken
  • Crater - Magmar, Slugma, Magcargo, Magby, Numel, Camerupt, Torkoal
  • Volcanic Pit - Groudon

• Jungle
  • Jungle - Oddish, Gloom, Vileplume, Bellsprout, Weepinbell, Victreebel, Exeggcute, Exeggutor, Tangela, Bellossom, Sunkern, Sunflora, Tropius

• Relics
  • Ancient Relic - Aerodactyl, Baltoy, Claydol, Regirock, Regice, Registeel
  • Aged Chamber AN - Unown (A-N)
  • Aged Chamber O? - Unown (O-Z + ! + ?)

• South Plains
  • Safari - Nidoran♀, Nidorina, Nidoqueen, Nidoran♂, Nidorino, Nidoking, Doduo, Dodrio, Rhyhorn, Rhydon, Kangaskhan, Tauros, Phanpy, Donphan, Miltank
  • Wild Plains - Rattata, Raticate, Ekans, Arbok, Farfetch'd, Drowzee, Hypno, Poochyena, Mightyena, Zigzagoon, Linoone, Zangoose, Seviper

• Desert
  • Furnace Desert - Sandshrew, Sandslash, Trapinch, Vibrava, Flygon, Cacnea, Cacturne

• Badlands
  • Ravaged Field - Spearow, Fearow, Skarmory, Houndour, Houndoom
  • Magnetic Quarry - Beldum, Metang, Metagross
  • Thunder Meadow - Sentret, Furret, Mareep, Flaaffy, Ampharos, Electrike, Plusle, Minun, Castform, Chimecho

• Eastern Ponds
  • Tadpole Pond - Poliwag, Poliwhirl, Poliwrath, Politoed, Lotad, Lombre, Ludicolo, Surskit, Masquerain

• Eastern Lakes
  • Waterfall Lake - Magikarp, Gyarados, Feebas, Milotic

• River
  • Rub-a-Dub River - Goldeen, Seaking, Totodile, Croconaw, Feraligatr, Volbeat, Illumise

• Eastern Forest
  • Mist-Rise Forest - Caterpie, Metapod, Butterfree, Weedle, Kakuna, Beedrill, Ledyba, Ledian, Yanma, Wurmple, Silcoon, Beautifly, Cascoon, Dustox
  • Flyaway Forest - Pidgey, Pidgeotto, Pidgeot, Hoothoot, Noctowl, Togepi, Togetic, Natu, Xatu, Murkrow, Swablu, Altaria
  • Overgrown Forest - Scyther, Pinsir, Sudowoodo, Scizor, Heracross, Treecko, Grovyle, Sceptile, Kecleon
  • Energetic Forest - Pikachu, Raichu, Meowth, Persian, Mankey, Primeape, Snorlax, Pichu, Aipom, Stantler, Slakoth, Vigoroth, Slaking, Skitty, Delcatty

• Mountain Range
  • Mt. Deepgreen - Geodude, Graveler, Golem, Cubone, Marowak, Gligar, Shuckle, Teddiursa, Ursaring, Spoink, Grumpig, Spinda
  • Mt. Cleft - Charmander, Charmeleon, Charizard, Larvitar, Pupitar, Tyranitar, Aron, Lairon, Aggron
  • Mt. Moonview - Clefairy, Clefable, Cleffa, Lunatone, Solrock, Jirachi
  • Mt. Discipline - Machop, Machoke, Machamp, Hitmonlee, Hitmonchan, Tyrogue, Hitmontop, Makuhita, Hariyama, Meditite, Medicham
  • Darkness Ridge - Vulpix, Ninetales, Gastly, Haunter, Gengar, Misdreavus, Sneasel, Sableye, Shuppet, Banette, Duskull, Dusclops, Absol
  • Rainbow Peak - Ho-Oh

• Marsh
  • Peanut Swamp - Wooper, Quagsire, Mudkip, Marshtomp, Swampert, Barboach, Whiscash
  • Poison Swamp - Grimer, Muk, Koffing, Weezing, Gulpin, Swalot

• Cave
  • Echo Cave - Zubat, Golbat, Crobat, Wobbuffet, Dunsparce, Whismur, Loudred, Exploud, Nosepass, Mawile, Wynaut
  • Dragon Cave - Bagon, Shelgon, Salamence
  • Boulder Cave - Diglett, Dugtrio, Onix, Steelix
  • Cryptic Cave - Mewtwo

• Ruins
  • Decrepit Lab - Abra, Kadabra, Alakazam, Mr. Mime, Ditto, Porygon, Porygon2
  • Power Plant - Magnemite, Magneton, Voltorb, Electrode, Electabuzz, Elekid

• Beach
  • Shallow Beach - Krabby, Kingler, Corsola, Wingull, Pelipper
  • Ice Floe Beach - Seel, Dewgong, Spheal, Sealeo, Walrein

• Northern Lakes
  • Mystic Lake - Lapras, Dratini, Dragonair, Dragonite

• Glacier
  • Frigid Cavern - Jynx, Swinub, Piloswine, Delibird, Smoochum, Snorunt, Glalie

• Northern Isles
  • Legendary Island - Articuno, Zapdos, Moltres

• Southern Sea
  • Treasure Sea - Horsea, Seadra, Remoraid, Octillery, Kingdra, Carvanha, Sharpedo, Anorith, Armaldo, Luvdisc
  • Deep-Sea Floor - Omanyte, Omastar, Kabuto, Kabutops, Chinchou, Lanturn, Lileep, Cradily, Clamperl, Huntail, Gorebyss, Relicanth
  • Seafloor Cave - Kyogre

• Southern Isles
  • Southern Island - Latias, Latios

• Northern Sea
  • Bountiful Sea - Tentacool, Tentacruel, Slowpoke, Slowbro, Shellder, Cloyster, Staryu, Starmie, Slowking
  • Serene Sea - Qwilfish, Mantine, Wailmer, Wailord
  • Deep-Sea Current - Lugia

• Western Isles
  • Final Island - Mew

• Southwest Isles
  • Enclosed Island - Deoxys

• Sky
  • Stratos Lookout - Rayquaza