Crispin is the watchman of Sinnoh's forests. He saw Magnezone and Metagross fighting outside the pit they normally battle, as the pit has frozen. However, Brock's tactics enabled the two Pokémon to fight in the pit, making Crispin happy that the problem was solved.
Magnezone lived on a mountain between Brussel Town and Daybreak Town and as a result of living on the mountain gained a lot of power that it could only release by battling a Metagross that also lived there. When the trench they lived in was flooded they started battling in a nearby town which often caused collateral damage which was only stopped when Ash and friends managed to get the water out of the trench. Magnezone proved to be very powerful in battle, helping to defeat Ash's Monferno and then knocking out Dawn's Mamoswine despite having a type-disadvantage to both.
Metagross lived on the same mountain as Magnezone and, as it was also a Steel type, also gained a lot of power from the mountain's magnetic fields that it could only release by battling. When the trench used for battling was flooded, it started battling Magnezone in a nearby town and was only stopped from destroying the town when the water in the trench was removed.