I think we should seriously consider what the differences, flavourwise, between Anticipation and Forewarn actually are...
Like, I always saw
Anticipation as a kind of animalistic, instinctive ability; the same sense of dread that sends domestic dogs scarpering before earthquakes in the real world (just checked the Japanese name... 'Danger Premonition'). The shuddering that accompanies the premonition, for example, is a very kinetic, bestial response, much less measured and human than the line of actual text that Forewarn gives us. I think this idea is mostly supported by the pokemon that get the ability, as they're all inspired by certain animals, and generally have more earthly, animal typings, such as Ground, Poison, Bug and Normal.
Meanwhile,
Forewarn (Japanese: Prophetic Dream) is an ability that seems more inspired by clairvoyance. Clairvoyance and Prophecy are far more human processes than anticipation; a measured and often pseudo-scientific approach to the prediction of the future, shown through the elegant, human process of dreaming, or the informed reading of signs (e.g. looking at the stars, tarot, etc.). It seems like while Anticipation is an ability for the animals, Forewarn is one for the people. And just look at the list of pokemon that get it! 4 of 6 are humanoid (the two fully evolved pokemon here, Hypno and Jynx, wield a prop and wear a dress, respectively) whilst the other two are the perpetually sleeping, perpetually prophetically dreaming, Munna and Musharna (hardly the vital, alert, shuddering animals characterised by Anticipation!). There's also the issue that every current Forewarner is a Psychic pokemon, and every current Anticipator is not; Forewarn is clearly an ability for the magicians, mind-readers and summoners, and now, potentially, the channelers, of the pokemon world.
Basically, I'm just saying that I dislike Anticipation. Anticipation -> Forewarn doesn't even feel like a natural evolution to me, considering how they seem like opposite ends of a spectrum, rather than different levels on a meter; our shrine maiden animalistically shudders with premonition usually, but somehow gains the eerie psychic power of prophecy through dreamworld? Perhaps it works for you, I dunno, but I don't see it. Forewarn isn't even its DW ability, it's its primary ability...
There's also the issue that no pokemon gets both Forewarn and Anticipation, and although that's obviously true of many ability combinations, wouldn't you expect it if the two abilities were as similar as you might believe? Our channeling, humanshape shrine maiden, with no animal features whatsoever - now that we've given her the human, evolved ability of Forewarn, do we really think it suits her flavourwise to give her Anticipation as well?
I am still supporting
Telepathy primarily, as I think it's the main NCA that can support the idea that we have some level of psychic power, which I don't think comes across as well if we give it Forewarn alone. As for
Own Tempo, I will say that the dancing argument seems to have come out of left field a bit. Whilst ancient Japanese channeling rituals do involve a fair amount of what I guess one could call 'dancing' (I would personally say 'spastic movement'), the design seems (to me) quite serene and stationary, and doesn't even have actual feet (which are pretty important for dancing, y'know). If Yilx, our main flavour authority (i mean, it is his design, and only he can inform us of its inspirations) comes into this thread supporting Own Tempo, though, then I might support it too.
PS sorry for long post, I take everything too seriously apparently
EDIT: Ehhh I'm actually okay with Own Tempo after all. I should have researched it better, but the design has always seemed to evoke
this more than
this in me for some reason. The slow, graceful movements of the second video certainly feel more in line with Own Tempo.