Meh two three-stage, green evolution families both in Gen 5 which are not commonly used.
Sewaddle’s evolution is not Whimsicott.
Sewaddle – Swadloon – Leavanny
Whimsicott – Petilil – Lilligant
On average, I know about 400 out of 649 names of Pokemon now. About 250 of them pretty detailed (type, evolution family), 150 of them are detailed (size, color), and 100 of them are more detailed (NatDex, notable things). Yay. That explains why I’m bad at memory; I’m full with Pokemon 😛