>Venonat and Venomoth
>Seel and Dewgong
>Goldeen and Seaking
>Natu and Xatu
>Hoppip, Skiploom and Jumpluff
>Stantler
>Wailmer and Wailord
>Spoink and Grumpig
>Barboach and Whiscash
>Baltoy and Claydol
>Chingling and Chimecho
>Glameow and Purugly
>Carnivine
>Finneon and Lumineon
>Dwebble and Crustle
>Elgyem and Beheeyem
>Bouffalant
>Bergmite and Avalugg
>Dhelmise
Most of them don't have any real quirks that make them stand out, they're not particularly amazing in any competitive environment (unless I'm missing something) and they usually fall into a weird middle category where they're not common Route 1 shitmons in-game, but they're not Gen 4 Munchlax-tier rare either - just sort of uncommon. Their purpose in life is to be caught and boxed. Unless you like them enough to use them for something.
