A Pidgey flew down and landed near them. "Alright, first off you need to weaken the Pokémon up." Liam explained. He tossed a ball into the air and Pikachu emerged. "Alright, Pikachu we're showing how to catch a Pokémon today, so ease up a little bit." 
"Pika." Pikachu nodded in conformation.
 "Now, Quick Attack!" Pikachu rocketed into the Pidgey and did fair damage. The Pidgey used Sand Attack.
 "It is also helpful to cast a status condition, like this, Thunder Wave!" Pikachu gave the pidgey a paralyzing shock. The Pidgey was unable to move.
 "Than you toss a Pokéball." Liam explained. "There are several kinds of Pokéballs, but more on that in a bit." Liam said. He tossed a Pokéball at the Pidgey. It was sucked in. The ball wiggled three times and pinged shut.
 "And Bob's your uncle." Liam said. He walked over and released the Pidgey from the ball. He used a Full Restore on it and let it go free.