Well, Rollout is just known by any Pokemon that has the capability of rolling into a ball. Hence Quilava learning it.
I have a very large suspicion that the move Fennekin learns at level 8 will be confusion.
As much as I want Chespin to become a Grass/Rock type, Rollout doesn't really point towards that at all. It seems more like a reference towards a hedgehog's ability to curl up into ball, as well as coverage to help make squashing Bugs in the first gym a bit easier.
But damn it if wouldn't be the greatest thing for Chespin to evolve into a Grass/Rock type with Head Smash, Wood Hammer and Rock Head as a hidden ability.
Yeah, I don't think Rollout is indicative of anything right now, other than Chespin can roll into a ball, like a hedgehog. Grass/Rock would be fine with me if it happens, however. In addition to Rollout, Chespin should learn moves like Defense Curl and Pin Missile to emphasise its spikey-hedgehogness. It could also get moves like Spikes and Steamroller, too. Also the above moves suggested by Winterdaze, along with the ability, would be amazing. Chespin is stated to have a hard head, I think? So Rock Head and Head Smash make a lot of sense.
And I finally decided between Froakie and Chespin, and I'm going to go with Chespin. Chespin > Froakie > Fennekin. But I really like all three.
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I also don't see Chespin becoming a bulky one, but who knows what it can become...
I'll be fine with whatever Chespin becomes. It'd only have two weaknesses if it was Grass/Rock or Grass/Steel, but six if it was Grass/Dark. We can rule out Bug, Normal, Psychic, Poison, Ghost, Dragon, Ice, Fire, Electric, Fairy, Flying, and Water as a secondary type for it, as it doesn't look like it'd fit into any of those. That leaves Dark, Rock, Steel, Ground, and Fighting.
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I am sorry, but why should we rule out Poison, Ghost, Flying, Fairy, Electric and even Ice? The others I understand, but I don't see why Chespin can't evolve into Grass/Poison or Grass/Fairy...?
Tepig evolving into a sumo wrestler, the major consensus was that it would evolve into a Pokémon version of Ganon from Twilight Princess. People also predicted that Dewott would become a fast and ninja-like Water/Fighting samurai and it became an awkward sea lion in the end. I also can't see Froakie evolving into a slow and bulky Pokémon, it looks like a Water-type version of Chimcar, so I am expecting a fast evolution for it.
Infernape. Water/Fighting with good offences and speed sounds pretty damn good to me. I've wanted a decent water/fighting for aaaages. And no, Poliwrath is not decent. It's highest stat is 95, with no real specialisation in one particular area, which means it is neither bulky nor sweepy. Yes, there's Keldeo, but unfortunately that's an event legendary which significantly hampers its in-game use, particularly if you didn't get it during the event.
I always figured Fennekin just didn't come with Ember, at lv. 5, like the other starters come with their elemental attacks, and instead learned it at 8, and then learned Howl at 11. But if that isn't the case and they are covering up an attack by showing Fennekin at 11, then that is much more fair and makes a heck of a lot more sense!
It probably isn't confusion, though. It's a bit too powerful to be learned so early, especially compared to what the others learn at the same level. Perhaps Psywave or Astonish, though.