Pikachu is Born! : Season 23 Episode 1

Four years prior to the day he began his Pokémon journey, a six-year-old Ash rushes downstairs to show his mother a poster advertising Professor Oak's Pokémon camp. Seeing her son's enthusiasm, Delia agrees to sign him up but admits he will have to get himself up and make his own way since she has things to do. Meanwhile, in the forested outskirts of Pallet Town, a young Pichu observes his surroundings.