Shou

Sho is a character of the day who appeared in Pika and Goliath!. He specializes in the Pikachu evolutionary line.

Sho initially came off as incredibly arrogant, a trait seemingly shared by his Raichu and Pichu. When his Pichu came across Ash's Pikachu, it called its Trainer over. Sho assumed it was a wild Pikachu, and was going to attempt to catch it before Ash explained it was his. Sho offered to trade his Mareep, Magneton, and Magnemite for Pikachu in order to complete his evolution collection. Of course, Ash refused on all offers and Sho started to accuse Ash of being a weak Trainer, and not being able to handle Pikachu's power.

From there on, he challenged Ash to a battle with his Raichu. Ash in turn uses Pikachu. Sho's Raichu knows two moves that Pikachu knows: Iron Tail and Volt Tackle. However, since it's fully evolved, it also knows the move Hyper Beam. One of Sho's battle strategies is to have Raichu pin down opponents with its tail and then fire a Hyper Beam at them for a finishing blow at point blank range, proving to be brutal, if not merciless. He enacted this technique on Ash's Pikachu which injured it so much that it needed to be sent to the Pokémon Center in critical condition.

Later on, Ash challenged him to a rematch. This time, Pikachu went on to defeat Raichu. Sho seemed to have a change of heart, accepting Ash and Pikachu's battling abilities and admitting defeat.

(Source: Bulbapedia)