I can't seem to find a thread, sooo I'll give a quick explanation of how to do it for your case. I hope you know the basics of breeding, otherwise, this could just fly right over your head. x_x
Egg moves are special moves certain Pokémon can get only through breeding. In the case of Absol, to get Mean Look on one, you would need a female Absol and a male Pokémon that it can breed with that happens to know Mean Look. Umbreon, for instance, can learn Mean Look through level-up and can mate with Absol, so a female Absol mating with a male Umbreon with Mean Look learned would give you a new Absol with Mean Look too.
After that, you'd teach the new Absol False Swipe and Thunder Wave and have a decent catcher Pokémon, though you'd still need to over-level it so it could survive.
Gallade would be similar, except the female Ralts can mate with a male Gastly/Haunter/Gengar and a number of other Pokémon to get Mean Look. Sadly, to get Hypnosis on a Gallade, you'll need to reach level 43, or level 50 in its second stage, Kirlia, before evolving it into Gallade. Lots of work in all cases, but quite worth it~
Edit: Shoot, forgot that Gastly/Haunter/Gengar can learn Hypnosis too, so if the male has both Mean Look and Hypnosis, you should get a Ralts with both moves, making this so much quicker. xD And make sure the Ralts you end up with is a male because females can't evolve into Gallade...Now this post has gotten too wordy, hope you understood all of this.