September CD Frenzy Plant announced!
As stated.
Answers
This getting confirmed is a huge deal. As long as Meganium gets the exact same FP as Venusaur, it's pretty safe to assume that all starters will get the same moves on their CDs. Which means HC Feraligatr will become the best non-legendary water DPS in January, FP Sceptile will become the grass DPS king in March, BB Blaziken will become the fire DPS king in May and HC Swampert will get almost Kyogre level water DPS in July.
I would argue that besides its CD it will be as hard to get as Magicarp. I would think Feraligatr and Gyarodos would have different situations to shine. Towards raid boss like Golem or Rhydon which have Rock/Ground double type, Gyarodos resists Ground while vulnerable to Rock. Feraligatr takes neutral damage from both types. So for boss with Rock type moves we should go with Feraligatr and leave Ground type to Gyarodos. Introduction of HC Feraligatr will just leave us more room to form optimal Water raiding team.
I'd argue that Feraligatr is much harder to evolve outside of its CD than Gyarados, but that's besides the point, the CD makes them super easy to get.
You are correct about the resistances, against ground Gyarados's extra bulk will be very valuable and it also has the advantage of being neutral to grass-type coverage moves if your target happens to have those.