Just pointing something out, but Shaymin changes forme outside of battle, with the Gracadia Flower (at least I think that's what it's called) being a key item: not inside. Thankfully Shaymin-S would come under the same clause as Rotom in your proposal.
Then I would prefer even earlier 6am my time Sunday or if I am correct noon your time Sunday if that's okay. But if not yeah anytime from 6-9am my time or noon-3pm your time expect to see me on smogtours / main as "pokemonisfun"
Thanks sir and see you soon :D