This is a great story I hope you give ash more Pokemon in this story besides canon. As for the Pokemon he and Twilight should catch I would suggest...

Ash:
Kanto: Shellder, Seel, Magikarp (shiny), Geodude, Vulpix, Growlithe, Ryhorn, Kabuto, Areodactyl
Johto: Houndour, Spinarak, Yanma, Magby, Stantler, Murkrow, Sneasel
Hoenn: Bagon, Trapinch, Anorith, Absol, Spheal, Duskull, Mudkip (shiny), Poochyena, Seedot, Aron, Zangoose
Sinnoh: Skorupi, Hippopotas, Stunky, Spiritomb, Cranidos
Unova: Deino, Axew (shiny), Golett, Larvesta, Zorua, Sawk, Throh, Shelmet, Venipede, Rufflet, Bouffalant
Kalos: Honedge, Tyrunt, Espurr (male), Litleo (male), Bergmite, Skiddo
Alola: Wimpod, Dhelmise, Jangmo-o, Dewpider, Passimian, Oranguru, Sandshrew
Galar: Zigzagoon, Yamask, Grookey, Scorbunny, Rookiedee, Dreepy, Silicobra, Rolycoly, Darumaka, Impidimp, Kubfu, Nickit
Legendary: Latias, Latios, Suicune, Rayquaza, Giratina, Mewtwo, Mew, Lugia, Cobalion, Terrakion, Virizion, Zekrom, Solgaleo, Zacian, Ho-oh
Mythical: Keldeo, Hoopa, Genesect, Darkrai

Twilight:
Kanto: Paras, Oddish, Magnemite, Staryu, Ekans, Meowth, Nidoran (female), Venonat, Caterpie, Hosea, Ponyta
Johto: Hoothoot, Girafarig, Miltank, Chinchou, Elekid, Yanma, Togepi, Smoochum, Teddiursa, Chikorita (shiny)
Hoenn: Skitty, Torchic, Volbeat, Illumise, Electrike, Plusle, Minum, Luvdisc, Clampearl, Mawile, Feebas, Beldum, Shuppet, Zigzagoon, Ralts, Lunatone, Solrock, Seviper, Numel, Meditite, Swablu
Sinnoh: Shinx, Bidoof, Bronzor, Froslass, Glameow, Burmy, Chingling, Snover, Piplup (shiny)
Unova: Vullaby, Deerling, Emolga, Klink, Lillipup, Purrloin, Woobat, Panpour, Petilil, Audino, Blitzle, Karrablast, Gothita, Solosis, Litwick
Kalos: Espurr (female), Litleo (female), Flabébé, Spritzee, Carbink, Fennekin, Scatterbug
Alola: Cutiefly, Morelull, Comfey, Vulpix, Fomantis, Bounsweet, Bruxish, Popplio (female), Stufful, Salandit (female), Geodude
Galar: Sobble, Ponyta, Gosseflur, Yamper, Applin, Cufant, Falinks, Snom, Morpeko, Hatenna, Indeedee (female), Milcery
Legendary: Celebi, Zamazenta, Lunala, Reshiram
Mythical: Shaymin, Meloetta, Victini
These are the Pokemon they should have in your story but that's just me. Keep up the great work. By the way what about Spike and the Cutie Mark Crusaders are they going to side with Twilight on her adventure with Ash Including Luna and Fluttershy as well? Just out of curiosity.

Well, that was the most unexpected update for me. But I like it!

Time to wait for the next chapter.

Great chapter. :) Looks like Twilight has a new friend and rival for the Hoenn League. It also looks like Misdreavus might want to join Twilight's team.

I guess team rocket is actually doing better. I'm surprised... (σ)σ

excellent work on this chapter and glad they were able to help each other out but I'm guessing Misdrevous is going with twilight?

dang that was deep Wally also great chapter

YES if you continue to update this now that shiningarmorxcadence has been canceled i totally vote for brock to be given the chance to be wholy dedicated to a women and her with him. Brock is de man in fact it's this EXACT adventure he came back after taking care of his matters so he could continue adventuring with ash like a bro. Which is kinda what this stories about.

I like the story so far :D but she hasn't caught Marill yet, and technically Birch should have given her a starter as well since he's the one who registered her as a trainer even though she has the Marill following her.

Whoever wrote this is good at making me cry

please continue this story

Update the next chapter I want to know what happens.

Is the Gym leader's name by any chance either Joey or Henry?

Wow... This story is truly AMAZING! Up to this chapter, i love everything about it. I do hope you haven't abandoned this remarkable story. I'll be honored to read more, comment, and share my thoughts to this great project. I look forward to read more about this. Please do continue.

I have an idea! How about Spike deciding to find Twilight and travel with her, but like dragon type Pokemon?