Here we go (cracks knuckles)
Gen 1
-Aerodactyl (Old Amber) - Pewter Museum from Old Scientist.
-Magikarp - Route 4 Pokemon center from Magikarp Salesmen.
-Omanyte (Helix Fossil) - Mt. Moon from unnamed nerd.
-Kabuto (Dome Fossil) - Mt. Moon from unnamed nerd.
-Bulbasaur (Yellow only) - Cerulean City from unnamed trainer.
-Charmander (Yellow only) - Route 24 from unnamed trainer.
-Squirtle (Yellow only) - Vermilion City from Officer Jenny
-Hitmonlee - Fighting Dojo from Karate Master.
-Hitmonchan - Fighting Dojo from Karate Master.
-Eevee - Celadon Masnsion rooftop.
-Lapras - Silph co. 7F from Silph Employee.
Gen 2
-Togepi (egg) - Violet City Pokemon Center from Elms' aide.
-Pichu/Clefa/Igglybuff/Tyrogue/Smoochum/Elekid/Magby (egg, Crystal only) - Day Care Center from Day Care Man.
-Spearow Goldenrod City north gate from Randy.
-Eevee - Bill's house in Goldenrod City from Bill.
-Shuckle - Cianwood City from Mania
-Dratini (Crystal only) - Dragon's Den from Master.
-Tyrogue - Mt. Mortar B1F from Kiyo
-Mareep/Wooper/Slugma (HG/SS) - Violet City Pokemon Center from Primo.
-Treeko/Torchic/Mudkip (HG/SS) - Silph Co. from Steven.
Gen 3
-Wynaut (egg, +ORAS) - Lavaridge town from Expert.
-Castform (+ORAS) - Weather Institute from Scientist.
-Beldum (+ORAS) - Steven's House in Mossdeep City from Steven.
-Chikorita/Cyndaquil/Totodile (+ORAS) - Littleroot Town from Professor Birch.
-Cosplay Pikachu (ORAS) - Any Contest Hall from Breeder
-Latias (AS)/Latios (OR) - Southern Island.
-Togepi (egg, ORAS) - Lavaridge Town from Expert.
-Snivy/Tepig/Oshawott (ORAS) - Route 101 from Birch.
-Turtwig/Chimchar/Piplup (ORAS) - Route 101 from Birch.
-Camerupt (OR)/Sharpedo (AS) - Battle Resort from Grunt.
Gen 4
-Togepi (egg, Platinum only) - Eterna City west gate from Cynthia.
-Eevee - Hearthome City from Bebe.
-Happiny (egg, D/P only) - Heathome City west gate from Hiker.
-Porygon (Platinum only) - Veilstone city from Pokefan.
-Riolu (egg) - Iron Island from Riley.
Gen 5
B/W
-Pansear/Pansage/Panpour - Dreamyard from unnamed girl.
-Zorua - Gamefreak HQ 1f in Castelia City from unnamed girl.
-Tirtouga (Cover Fossil)/Archen (Plume Fossil) - Relic Castle from backpacker.
-Larvesta (egg) - Route 18 rest house from Ranger.
-Omanyte|Kabuto|Aerodactyl|Lileep|Anorith|Cranidos|Shieldon - Twist Mountain from Worker, one per day randomly.
-Magikarp - Marvelous Birdge from Magikarp Salesman.
B2/W2
-N's Zorua - Driftveil City from Rood.
-Deerling - Route 6 Weather Institute from a researcher.
-Eevee - Castelia City from Amanita.
-Omanyte|Kabuto|Aerodactyl|Lileep|Anorith|Cranidos|Shieldon|Tirtouga|Archen - Join Avenue from the Antique Shop.
-Magikarp - Marvelous Bridge from Magikarp Salesman.
-Happiny (egg) - Nacrene City west gate from breeder.
-Omanyte|Kabuto|Aerodactyl|Lileep|Anorith|Cranidos|Shieldon - Twist Mountain from Worker, one per day randomly.
-Tirtouga/Archen - Nacrene City museum from Lenora.
-Dratini (W)/Gible (B) (shiny) - Floccesy Town from Benga.
Gen 6
-Bulbasuar/Charmander/Squirtle - Lumiose City from Professor Sycamore.
-Tyraunt (Jaw fossil)/Amaura (Sail fossil) - Glittering Cave from Fossil Lab assistant.
-Lucario - Tower of Mastery from Korrina.
-Lapras - Route 12 from Breeder.
Gen 7
-Eevee (egg) - Pinola Ranch from Breeder.
-Shieldon (Armor Fossil, Moon)|Archen (Plume Fossil, Moon)|Cranidos (Skull Fossil, Sun)|Tirtouga (Cover Fossil, Sun)
-Porygon - Aether House from AF Employee.
-Type: Null - Aether Paradise from Gladion.
Source.
Any corrections are welcome.
