My ideal Ash roster for Pokemon Journeys:
Nuff said.
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These two are pretty much confirmed.
Lucario: Aura Sphere, Force Palm, Meteor Mash, Extreme Speed
Sirfetch'd: Meteor Assault, Brutal Swing, Leaf Blade, Brave Bird
Cramorant and its Pikachu gag are heavily marketed. I could see the writers having Ash catch one that likes to scoop up Pikachu (and maybe even sometimes Ash). It would be a fun gag mon and I think would inject a lot of personality into Ash's roster. Access to Dive, Drill Peck, Weather Ball, Ice Beam
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I could see Ash and Goh each catching a member of a pair of sibling Toxel, who then evolve into Toxtricity. I could see the baby Toxel being tough to take care of and destructive crybabies for the lulz and evolving into music-loving Toxtricity. Access to Overdrive, Sludge Wave, Boomburst, Power-Up Punch
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G-Meowth and Perrserker being battle-loving Pokemon and vikings really strike me as Ash Pokemon. I could see them having fun interactions with TR and Meowth, and having a varied and tricky moveset to differentiate from the other resident Steel-type on Ash's team, Lucario with access to Iron Head, Throat Chop, Play Rough, Dig
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I'm happy that a lot of Swsh's regional forms seem 'fitting' for Ash in a lot of ways (to serve as parallels to other cast mates' Pokemon, as well as in design) and I think seeing Ash try to handle a hyperactive, maniacal Zen G-Darmanitan would be loads of fun. Access to Avalanche, Flame Wheel, Bulldoze, Zen Headbutt
Not really big on Ash catching too many more previous Gen Pokemon, but Tyranitar would make a neat addition--especially if it's a grown-up Larvitar from Ash's Johto journey. Access to Stone Edge, Stomping Tantrum, Crunch, Fire Fang
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I think next to Zoroark, the Minccino line is the most marketable Unova 'mon that Ash hadn't caught. Seeing it in action in the last episode made me realize how much I wanted it on the main cast since its reveal... Access to Tail Slap, Aqua Tail, Triple Axel, Gunk Shot
Access to reserves:
I only see chances for previous starters, and the Alola crew, making triumphant--albeit temporary--returns once Ash climbs up the ranks. I'd love to see his Squirtle and Oshawott return to evolve, as much as I doubt it happening. Greninja seems like a shoo-in at this point.
These "predictions" are more like
my personal wishlist and not what I think is most likely... Ideally for me, he'd have just a team of Galar 'mons plus old reserves, but I might as well stick with somewhat likely predictions based on the precedence this series has set thus far with some old-Gen Pokemon being thrown in the mix!