The Pokemon Locations below are only SOME of the places to find the listed Pokemon.

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Snivy = Ilex Forest
Tepig = Union Cave
Oshawott = Route 32
Patrat = Route 44
Lillipup = Route 101, 102, and 103
Purrloin = ???
Pansage = Route 11 + 38
Pansear = Route 2
Panpour = Route 3 + Route 4
Munna = ???
Pidove = Route 2
Blitzle = Route 17 + 30
Roggenrola = Mt. Moon + Union Cave
Woobat = Mt. Moon, Dead End Cave
Drilbur = Route 11 + Route 38
Audino = Mt. Mortar
Timburr = Route 4, Mt. Moon, Union Cave
Tympole = Route 102 + 117
Throh = Route 26
Sawk = Route 26
Sewaddle = Routes 8, 37, 101
Venipede = ???
Cottonee = Route 8 + 37
Petilil = Route 11
Basculin = Route 23, 42, 43 via Old Rod
Sandile = Route 11 or 38 at Night
Darukama = ???
Maractus = ???
Dwebble = Dead End Cave
Scraggy = Mt. Moon
Yamask = Pokemon Tower, Bell Tower, or Mt. Pyre
Tirtouga = Pewter City Fossil Garden
Archen = Pewter City Fossil Garden
Trubbish = Route 110
Zorua = Moss Rock or Route 101
Minccino = Moss Rock or Safari Zone
Gothita = Ice Path or Route 102
Solosis = ???
Ducklett = Routes 8, 23, 42
Vanillite = Seafoam Islands
Deerling = Route 117
Emolga = Moss Rock
Karrablast = Midwood Forest
Foongus = Routes 11 + 38
Frillish = Routes 20, 44, 127 via Old Rod
Alomomola = ???
Joltik = Midwood Forest
Ferroseed = ???
Klink = ???
Tynamo = ???
Elgyem = ???
Litwick = Bell Tower
Axew = Dragon's Den or Safari Zone
Cubchoo = Seafoam Islands or Ice Rock
Cryogonal = Ice Path
Pawniard = Pokemon Tower or Mt. Pyre
Bouffalant = Safari Zone
Rufflet = Safari Zone + Life Peak
Vullaby = Safari Zone + Life Peak
Heatmor = Midwood Forest
Durant = Midwood Forest
Deino = Dragon's Den + Meteor Falls
Larvesta = Midwood Forest