Route 20 (Kanto)
    PokémonTypeRarityLevel
    ChinchouChinchouSuper RodUncommon25–40
    ChinchouChinchouGood RodRare10–25
    GyaradosGyaradosSuper RodUncommon25–40
    HorseaHorseaSuper RodUncommon25–40
    HorseaHorseaGood RodCommon10–25
    KinglerKinglerSuper RodRare28–40
    KrabbyKrabbySuper RodUncommon25–40
    KrabbyKrabbyGood RodCommon10–25
    LanturnLanturnSuper RodRare27–40
    LaprasLaprasWaterLure38–38
    MagikarpMagikarpOld RodVery Common5–10
    MagikarpMagikarpGood RodUncommon10–25
    PsyduckPsyduckSuper RodRare25–40
    SeadraSeadraSuper RodRare32–40
    ShellderShellderGood RodRare10–25
    ShellderShellderSuper RodUncommon25–40
    SlowpokeSlowpokeSuper RodRare25–40
    StaryuStaryuSuper RodUncommon25–40
    TentacoolTentacoolGood RodCommon10–25
    TentacoolTentacoolOld RodUncommon5–10
    TentacoolTentacoolWaterHorde30–35
    TentacoolTentacoolWaterVery Common30–35
    TentacruelTentacruelSuper RodRare30–40
    TentacruelTentacruelWaterHorde30–35
    TentacruelTentacruelWaterUncommon30–35