Oops, it doesn't look like 'peepachu day' is a national day..

Other days

bubble bath

Bubble Bath Day
ride the wind

Ride The Wind Day
china

China Day
offer

Offer Day
kiss a ginger

Kiss A Ginger Day
polyamory

Polyamory Day
mean girls

Mean Girls Day
buddy

Buddy Day
brow

Brow Day
hannah

Hannah Day