2. I know that Hidden Ability Sinistea is available, but how about Hidden Ability Antique Form Sinistea.
I know Antique Form Polteageist can have Cursed Body, but seeing that Antique Form cannot be bred, is there any other way getting A.F. Sinistea?
Thanks in advance.
Though I can't answer your question about Weezing as I haven't yet attempted to bring in a Hidden Ability Weezing (or Koffing, for that matter), to my knowledge, you can't get the authentic Sinistea with Cursed Body. There are very few not-fully-evolved Pokémon available in Sword & Shield that can have Hidden Abilities, and Sinistea is not one ofthem.