How to use Regenerator properly

The amount of money you will lose since FireRed and LeafGreen (with the exception of Emerald) is determined by:

Money = Level * Base Payout

Level is the highest level pokemon of yours and the base payout is based on the number of badges you have.

Badges/Payout

• 0/8
• 1/16
• 2/24
• 3/36
• 4/48
• 5/60
• 6/80
• 7/100
• 8/120

For example, if you have 5 gym badges and your top level pokemon is 30, your money lost for defeat would be 30 * 60 = 1800.

Source (bulbapedia)

While it is possible the bulbapedia article is outdated given the site's recent downtime, serebii's battle changes page lists no change to the payout system in gen V.

The first step would be acquiring a Mienfoo, which can be found in Route 14, Dragonspiral Tower, and Victory Road. The easiest way to breed for a specific nature is to find a Ditto with the nature you want the offspring to possess. From there, give the Ditto an Everstone and put the Mienfoo and the Ditto in the Day Care. The Everstone makes it so that the offspring has a 50% chance of inheriting the female parent's (or Ditto's) nature.

After this, you would just breed over and over until you get an offspring with 31 in either Attack or Speed. Give that baby Mienfoo a Power Bracer if the 31 is in Attack, or a Power Anklet if the 31 is in Speed (this forces that IV to be passed on). Repeat the process until you have a 31 in Attack and Speed, and hope that the ability is Regenerator.

_{I forget if you need to have a different parent in order to breed the offspring, or if you can just use the same Ditto again.}

Checking IVs

The easiest way to check for IVs is to stockpile a lot of Rare Candies. Take note of the Pokémon's stats at each level, and input them into this calculator. The more levels you take note of, the more the calculator will be able to pinpoint your IV. (You can reset your game after testing each Pokémon so you can use the same Rare Candies over and over.)