SoulN7

I suggest you using an Hariyama with Knock Off and Vital Throw, a 70-power move really useful. Try to get a Xatu or a Swoobat for her Bewear.

Oh, got it, thanks

How can I get this Budew?

I think I'll add him in my Intense Mode character. I'm using many Pokémon I didn't use in my other runs.

Another good Pokémon is Hariyama, which is a decent tank. In some case, it will be your savior thanks to Fake-Out already learned since Makuhita in Sheridian, Knock Off and even, if you're lucky, Force Palm. Can help you with some Double Battle. Just pay attention to some fields which can nullify priority moves and boss with shields. Thick Fat helped me in Angie's fight. Seeing Keta using an Hariyama with Fake Out in Intense and seeing him being defeated with the same strategy is hilarious.

In Casual Mode, 2 Fletchinder got Madame X's Yveltal finish all Decimation's PP, letting him only struggling against my team. Grimmsnarl is really good with some moves like Spirit Break, which lower Sp Atk, and more. He got the best against a poor Angel Gardevoir, which can't do much against his unique type combo. Silvally with Electric-Poison-Rock and more memory helped me even with a Crest-Torterra, which got only Ground and Rock as weaknesses. Gardevoir with Double Team and Calm Mind is good too with Special offensive Pokémons.

I don't know, but in Intense Mode, Rift Galvantula went in ATK and speed down with Growl and Eldegoss's Ability (if hit, every Pokémon around will have -1 in speed, works with physical and special moves)

This is getting interesting...

I finished just 2 days ago the V13 and I put here some of my theories or things I noticed. Spoiler here:

Just to going on the story. You have to reach like 1 000 000 points to unlock the "next level" . Just do some battles and talk to one of the npcs to get a 10x sponsor, so you can reach 1 000 000 in the 100 000 points battle. Sponsor are multipliers for points obtained in the battles in the small arena behind Zetta.

I saw that every character has a Mystical Pokémon in team in Intense...Maybe we can obtain the one of our character(My character is Aevis = Keldeo)in future?

Rejuv is pretty an hard game, even in casual. It has long battle and sometimes intenses, despite the difficulty. It's up to you to take out tactics and more, even the weirdest ones. Example for my plays: Today I started Intense Mode for the first time...and...sometimes, some battles are HARD, but others maybe you can pull out something which works for battles in short time. (like me -with a Beedrill with Bug Bite and Harden which sweeped half of Venam's team, included a Seviper which is supposed to have Glare and Bulldoze- and a Glameow with Hypnosis)

There are Banettite or Heracronite from Hidden Library's quests, meanwhile there are Absolite and Abomite from Sashila Village's quests. I only know them.

In V13, it is now changed, with Emma being a strange psychic "cloak?" and Melia is finally shown in the Blacksteeple Pinnacle

I used a Gothitelle, which tanked an hit and used Rock Tomb, so I was faster with my other Pokémon. I beat him at the first try, sacrifing even my Charizard with Rock Tomb, so Kyogre got -2 in speed.