Rico is a Pokémon Hunter. He had captured a variety of wild Ekans and Koffing until Team Rocket freed them. Officer Jenny arrested him with the help of Ash and co. He's in prison for now.
Every since he was about seven, his father had always punished him, saying he never worked hard enough and never caught enough Pokémon. Rico would then fight back, saying he worked as hard as he could. This would result in his father kicking him and screaming at him. Then, one day his father chased him out of the house, saying to never come back until he could be a worthy son. So, Rico traveled around, catching as many different Pokémon as he could. But, when Team Rocket freed his captured animals, he gave up and let himself be taken to jail for he couldn't face his father with only two new Pokémon. Now no one knows where his father is. Rico cries at night, muffling his voice in his arms, for all he wants is to go home and make his father happy.