Diolch am eich amser!
Thanks for the quick response. I'll wait until the past gens thread then!A past gens mega thread is something that is planned for the near future; there won’t be individual threads for every OM. So, to answer your question, no.
However, if you’re referring to a specific OM that is based on a particular generation like let’s say Gen 2 with abilities, that is fine to submit.