Questions about Synchronize's out-of-battle ability in Emerald

[Misdreavus]

1. Does anyone know by what percentage Synchronize increases the chances of encountering a Pokémon of the same nature?
2. Do these chances increase if I have multiple Pokémon with Synchronize and the desired nature with me?

I just want to see if it's going to be worth my time to buy Abras in FRLG, reset until I get 5 of a certain nature, and bring them with me to catch Dittos in Emerald until I get one with good enough IVs to use for breeding. Thanks in advance!

 

[The Emerald King]

1. Does anyone know by what percentage Synchronize increases the chances of encountering a Pokémon of the same nature?
2. Do these chances increase if I have multiple Pokémon with Synchronize and the desired nature with me?

I just want to see if it's going to be worth my time to buy Abras in FRLG, reset until I get 5 of a certain nature, and bring them with me to catch Dittos in Emerald until I get one with good enough IVs to use for breeding. Thanks in advance!

1. don't know.
2. No it does not help if there is more than one with synchronize and the desired nature in your party.

 

[Slim]

Back when Pokemon Forever was still around, they said the Pokemon with Syncronize must be in the lead spot, so multiple won't work. According to them, it made it a 50% chance of being the same nature.

 

[Misdreavus]

Ah, okay. I didn't know it had to be in the lead spot. I had my Adamant Umbreon from Colosseum in 6th and I was wondering why I never ran into Adamant Dittos in the Desert Underpass (I figured it must have been a pathetically low percentage). Thanks Emerald King and Slim!