1. I would say modestI'm currently replaying through Platinum with an ID/SID that makes both the flawless Modest and Timid spreads shiny, and I'm up to the point where you can catch Rotom from the Old Chateau. Initially, I was going to catch it and just use it on my In-game team, but I figured since it was a genderless Poke, I might as well RNG it and catch it in a cool ball for when I fix/replace my 3DS.
So, three questions:
1: Modest or Timid for Rotom?
2: Should I go for a flawless shiny, or non-shiny with a cool HP type or something?
3: Best ball for Rotom? Both shiny and non-shiny?
2. Maybe non-shiny with good HP, because shiny doesn't match that good with any ball, but regular looks good in Repeat.
3. Repeat for regular, for shiny I don't really know.