Brock catches a Bonsly.
The ninja outfits worn by the characters at the ninja school are similar to those worn by Koga and Aya in Sekichiku Ninja Confrontation! (1997). Coincidentally, the next episode is set in Fuchsia City, where Koga's Gym is located (although in the anime, it was in a forest outside the city itself).
The English title is a pun on the idiom "from cradle to grave."