teeny tiny newborn pichu and their happy but exhausted momma

As you probably saw in Pika's reference info, Pika has 15 whole ass kids. This is her first litter, consisting of "Ace"/Ash's Pikachu, Percy, Miss, and Scooter. i'll explain the ash's pikachu thing later

Their markings are quite out of the norm, as Pika is a Fancy Pikachu (or a Fancy mix/cross). Fancy 'chu is a variant of domesticated 'chu with markings not typically found in wild 'chu. They are more human-friendly, thus easier to train so they are great for younger trainers. They can come in ~10% to 100% brown/black spotting, but the latter is very rare. Females typically have more spotting than males.

Pokémon|Pikachu|Pichu © Nintendo|Game Freak
Pika|Percy|Miss|Scooter|Art © skytroops