The Drag Mule Train

The Drag Mule Train

Mule Drag Team 

As previously mentioned, among the many different types of "Mule Pokemon" (a Mule is just a special utility Pokemon who does one or two things of use to you that you would not want to assign to a regular team member) is the Drag Mule -- a Pokemon that has the natural ability called Pick Up that allows it to "find" items upon exiting a battle.

To set this up you need to head over to Route 5 and catch at least 5 Meowth -- preferably 6.  Then you need to pick one to be the Team Leader, and you need to level it to around 30 or 31.  Once you have it to that Level area, teach it the HM Cut, and then assemble your team with that one in the Number 1 Position, then head out to a section of tall grass that has Pokemon that it can easily one-hit-kill.

The mechanics of this are simple: There is a 10% chance that each of your Drag Mules will "pick up" an item as you are exiting battle mode. 

It may sound unlikely, but using a Drag Mule Train (a full party of Meowth) can get us items that we really need for the final battle with the Elite Four.  Items like Rare Candy, Ether, and PP-UP -- basically the stuff that we need to both prepare for that big battle and survive while in it... 

A good target goal is around 25 Rare Candy and a dozen or so of the other items -- once you have that many you can stop.

Good luck!