Pocket Monster HeartGold SoulSilver [Zukan Kansei] Kanpeki Guide

A Trainer named Soul attempts to capture a wild Sentret, but due to his lack of knowledge, he fails to capture it and another Trainer shows up to help him. After weakening the Pokémon, Soul manages to catch it and then attempts to catch a wild Bellsprout. Soul's Cyndaquil accidentally defeats the Bellsprout, however, and Soul is unable to capture it. The Trainer helps him again and Soul then manages to catch a wild Growlithe. As Soul is about to leave to a new area to find more Pokémon, the Trainer stops him and teaches him that he can fish for Pokémon in bodies of water, that different Pokémon appear at different times of the day, and that some Pokémon can be found by using Headbutt on trees. The two are then interrupted by a wild Steelix and Soul tries to fight it with Cyndaquil. The Steelix tackles Cyndaquil and Soul realizes that the Steelix is too strong. The Trainer hands him a Heavy Ball and tells him to use it. Soul has Cyndaquil use Flamethrower, and whilst the Steelix is engulfed in the flames, he throws the Heavy Ball and catches it. The Trainer explains that the Heavy Ball was made from Apricorns and the Poké Ball smith Kurt makes them as well as seven other types with its own feature. Soul shouts that he is aiming towards completing the Pokédex. (Source: Bulbapedia)