ShadowStar

Actually a really nice Team. I'll suggest some Moves since you did not post any.

What I'd Do EVs and IVs don't matter that much at all in game, but I'll give some recommendations on what to focus on

What I'd Do:

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It's meant to be an intimidating first boss Pokemon, but not too hard to beat.

Leafeon is actually quite nice with Nature Power, Swords Dance, Leaf Blade, and X Scissor / Sunny Day / Quick Attack. Umbreon is alright if you want to play defensively, put that's pretty unpopular ingame. Flareon is viable, but pretty flawed. Guts is nice with Toxic Orb, though.

Malamar has the unique ability of setting Inverse Terrain with Topsy Turvy, which makes it pretty great (especially alongside Types such as Normal, Psychic, Poison, and Grass)

Diggersby is pretty good with Huge Power, Swords Dance though Level Up, Earthquake from Level Up, Take Down or Strength or Facade for STAB, Quick Attack for Priority. It's also pretty early in Reborn too.

For Reborn, I started with Infernape and just wanted to fill the rest of my Team with Pokemon that I liked / was interested in using that didn't share the Fire or Fighting Typing with it. First, I found Budew through the Peridot Ward Event. Then, I trained a Biberal and traded it away for an Abra (Old Version) [Event now gives Litleo]. I caught a few filler Pokemon, such as Raticate, in order to help me stand up to Julia and Florinia. Then, I got Marill from the Jasper Ward Event and Mareep from the Jasper Police Station (Old Version) [Mystery Egg is given by Jasper Police and Mareep is 100% Event in Jasper]. Then, I found a Ground Type in Donphan and my Team was complete! . . .That was until X and Y came around and two Pokemon interested me. First, Diggersby piqued by interest because of Huge Power and Swords Dance. Also,it would form the "Double Bunny" Core with Azumarill. Malamar also interested me because of Contrary and Topsy Turvy, and later it truly showed its worth because of Topsy Turvy creating the Inverse Field. My Reborn Team can be found in my Signature. For Rejuvenation, I wanted the Types of my Pokemon to mirror the Types of my Reborn Pokemon due to Rejuvenation receiving inspiration from Reborn. However, I ended up leaving one Type (Dragon) out of the mix due to Typhlosion being amazing. My Rejuvenation Team can also be found in the signature. In short, I build my Team simply by using Pokemon that I personally like while making sure that none of their Types overlap. If the Pokemon I use aren't very commonly used, that's a bonus!

Neither of these are obtainable ingame. Though, I will point you in the direction of the Abomasite which may prove useful for your purposes.

196. . .

1.) Sludge Bomb is not available via TM, only Poison Jab and Sludge Wave are. [Gunk Shot is also available via Tutor] 2.) Stone Edge is available via TM and Stealth Rock is available via Tutor, but Rock Slide is unavailable.

I'd recommend Togedemaru once you gain access to it. Nuzzle + Zing Zap + Iron Tail + Slash and Burn / Spiky Shield / Fell Stinger make it a fun alternative to the ever popular Magnezone.

Primarina is VERY good. I'd recommend Primarina because of the Dual Typing, but Sylveon is great as well. Primarina's high Special Attack combined with its very useful STABs make it a great choice.

Here are my personal recommendations:

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Whenever I play a mainline game, I only use Pokemon native to that Region (Alola Forms count as Alola Pokemon). For fangames, I don't repeat Pokemon in order to avoid becoming bored.

I mainly take advantage of Inverse Terrain in order to open up more weakness on my opponent's team.

Chimchar -> Monferno -> Infernape Budew -> Roselia -> Roserade Abra -> Kadabra -> Alakazam (Was available early when I started) / Inkay -> Malamar Mareep -> Flaafy -> Ampharos Marill -> Azumarill Rattata -> Raticate / Phanphy -> Donphan / Drilbur -> Excadrill I've only replaced Alakazam (Contrary Malamar intrigued me) and Rattata (Useful Early-Game) and Donphan (Like Excadrill better) I never saw the need to build a massive rotation as my core team carried through the game nicely enough

If you don't feel like doubling down on Bug Types, Pangoro / Scrafty and Toxicroak are very good options. Pangoro is a beast with Hammer Arm + Iron Fist and it has Bullet Punch / Poison Jab to help counter Fairy Types. Scrafty as Dragon Dance and Moxie / Intimidate. Toxicroak is nice because Poison is pretty nifty in Reborn due to Field Effects. Of course, you can use Mega Herracross and perhaps replace Leavanny with a Grass - Poison Type such as Venusaur or Roserade.

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Phione's status as a Mythical (a sect of Legendary) Pokemon is often disputed even between official sources. I don't know how Phione is coded into the actual games, but I'm pretty sure it isn't 100% legendary. As for Manaphy, it'll be postgame due to disputable Mythical status.