Not that I've been aware of. I don't keep to up to date on current events though, I just kind of run whatever's in special + monthly and I haven't seen the Py invade appear since Rainbowpys were introduced.Speaking of skilling up crazy obnoxious monsters, have they re-run the py-in-mythicals in JP recently? I'd really like to use Hexazion, but I don't think I'll be able to skill him up until that event happens again.
I built a coop hexa farm team as my answer to getting skill ups but spamming arena and trading pys isn't the worst thing to do right now. A1 gives about 500k XP and A4 is over 2 million. Certainly more time consuming than running Nordis but it'll still get the job done.