I was so dumb and misinformed in the beginning (and I think I realize this as I was resetting)-You cannot manipulate static encounter Pokémon's nature using the ability synchronize. Only normal wild encounters.
Here I catch a Timid Southern Island Latios in Pokémon Emerald! I soft reset for a beneficial nature.
37:09- Timid Latios finally appears!
The rest of the video is a continuation of setting up for customizations
-I trade Pokémon holding really rare items for cloning in Pokémon XD: Gale of Darkness to my Pokeman Emerald save file for cloning.
-I organize and clone Pokemon in my Emerald save file
-Trade the Emerald Clones onto the Customized Save File
Pokémon Ruby and Sapphire Statistics For The Authentic Pokéman
At present, The Authentic Pokéman has 25 views spread across 2 videos for Pokémon Ruby and Sapphire, and about 4 hours worth of Pokémon Ruby and Sapphire videos were uploaded to his channel. This is 2.10% of the total watchable video on The Authentic Pokéman's YouTube channel.