It's a really rare equipment, by the time the people get there you won't need to catch a Pokemon, so no you won't need it. and I'm gonna use the games as a guide for the Pokemon that appear along the journey, if one of the Pokemon you want to catch is there...hmm I guess the best way to descibe it would to be state the desired Pokemon in the post and be in control of the battle, take into consideration the moves an unevolved wild Pidgey would know and don't forget that it's pretty fast for something so little. Who at level 5 is faster a Pidgey or a Ralts? The Pidgey is faster obviously so it would go first have your Pokemon counter...just the same as you would normally do a battle in a game.