What's a good Pokemon nature + ability to catch other pokes?

Question

Including moves that makes pokes sleep, paralyzed, or trapped

Comments

I think the only time you'd ever need a specific nature is when you want to synchronize for a specific nature. There are a few useful abilities, though.
Synchronize: useful when you want a specific nature
Pressure, Hustle, Vital Spirit: useful when you want high-level Pokemon
Cute Charm: useful when you want to shiny hunt in Generation 4
Suction Cups, Sticky Hold: useful when you're fishing

Answer 1

Generally I use a Synchronise Pokemon (such as Gardevoir or Alakazam), with a damaging move, recovery, status (either sleep or paralysis), and then another (much weaker) move to lower the original Pokemon's health and start an SOS chain. What Synchronise does is it makes a 50% chance for wild Pokemon to have the same nature. In this case, there is a 50% chance for wild Pokemon to have a Bold Nature (+Def, -Atk). My capture Alakazam is as follows.

Alakazam (M) @ Leftovers
Ability: Synchronize
EVs: 252 HP / 252 Def
Bold Nature
IVs: 0 Atk
- Thunder Wave
- Recover
- Psychic
- Signal Beam

So Thunder Wave is really useful for catching Pokemon, as it spreads paralysis, and can stop the target moving, thus saving their PP so you have more turns to catch it. Recover is an absolute must, as it enables 'Kazam to regain health, and also stall turns. Psychic is a standard STAB attack, used for weakening stronger foes, and also for killing Pokemon called in via SOS. Signal Beam is a much weaker option, so is used to lower health. It also covers Dark types immune to Psychic. However, the chance to make the target confused is irritating, as more than once I have seen a shiny die due to hitting themselves in confusion.

Comments

What if he needed false swipe or a sleep move or something? An Alakazam won't let him catch everything.

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But he can get the majority...