Considering he has Flame Charge, Fire Blast, and Fire Fang, yes, it is redundant.
Being physical or special never mattered in the anime and coverage rarely matters. I still stand by the notion that both Fire Fang/Blast are redundant. Having no reference to the basically the only Pokémon it battled and the reason behind both of its evolutions is weird. Don't see why he shouldn't have CC because of those 2 when he's always had coverage on a mon that another Pokémon's STAB covered (Greninja's Aerial Ace on a team with 3 Flying Types and Dig on Infernape on a team with 3 Ground Types.)
I don't think you're getting what I said. Incineroar is primarily a Fire-type. Fire-type moves should be the core of its moveset (unless they go the Dark-type route, but I think we all can reasonably assume that's not happening). All three moves have a clear and separate use (close range, speed and non-melee). Whereas Revenge and Cross Chop are both melee physical Fighting-type moves that shouldn't take up 50% of its moveset. If you're doing that then you have no point in calling Fire Blast redundant in the first place.
You can't call Fire Blast redudant and throw both Revenge ánd Cross Chop on a Fire/Dark-type - and not expect the redundancy argument to fall incredibly flat. I'm not saying that Incineroar shouldn't have CC because he already as 2 Fighting-types on his team. I'm saying that he shouldn't have Revenge AND CC on a Fire/Dark-type. What you proposed is the equivalent of giving Greninja Aerial Ace ánd Acrobatics to augment on your Greninja example.
As for your reference to the Sinnoh Team. Here's a hint: Ash never had 3 Ground-types
on his team at ANY point during the DP-series, nor did Torterra and Gliscor have Ground-type damaging moves. So you're example boils down to Infernape and Gible both having Dig, which in turn again never fought in the same battle, but I guess for now the same can be said about Incineroar and his two 'Journeys'-Fighting-types.
Darkest Lariat will be that reference to Kukui's Incineroar. Problem solved.
Whether or not having a mixed set matters isn't relevant, but most of Ash's best Pokemon have moves that allow them to fight in close range or launch projectiles/shockwaves, just look at this list:
- Pikachu: Tbolt, ElectroWeb, Iron Tail (Volt Tackle back in the day).
- Charizard: Flamethrower, Seismic Toss, etc.
- Squirtle: Hydro Pump, Skull Bash.
- Muk: Body Slam, Sludge Bomb.
- Snorlax: Body Slam, Hyperbeam.
- Heracross: Megahorn, Hyperbeam.
- Quilava: Flame Wheel, Eruption.
- Bulbasaur/Bayleef: Vine Whip/Razor Leaf. And Solar Beam in Bulba's case.
- Noctowl: Sky Attack, Air Slash, Extrasensory.
- Donphan: Earthquake, Hidden Power, Hyperbeam.
- Sceptile: Leaf Blade, Bullet Seed, Solarbeam.
- Infernape: Flare Blitz, Flamethrower
- Torterra: Leaf Storm, Rock Climb
- Buizel: Water Gun, Aqua Jet
- Gliscor/Krookodile: Mostly physical, but Stone Edge was basically a projectile move.
- Oshawott: Razor Shell, Aqua Jet, Hydro Pump.
- Pignite: Flame Charge, Flamethrower, Fire Pledge.
- Leavanny: X-Scissor, Energy Ball.
- Scraggy: HJK, Focus Blast.
- Boldore: Rock Smash, Rock Blast.
- Talonflame: Brave Bird, Razor Wind.
- Tauros: Take Down and Fissure (was treated as a move it could use without literally locking horns).
- Lycanroc: Stone Edge, Accelerock.
- Naganadel: X-scissor and Dragon Pulse.
- Melmetal: Flash Cannon and Double Iron Bash.
- Rowlet: Seed Bomb and Brave Bird.
Heck, the only ones I can remember purely one sided attackers are Primeape, Swellow, Staraptor, Hawlucha and as of now Farfetch'd (physical) and Lapras and Goodra (special). I think we can clearly say that for the clear majority, the writers do tend to use a mixture of physical and special moves (or at least moves that very clearly don't require contact i.e. Stone Edge, Seed Bomb and Water Shuriken).
And of the ones that were either one or the other, what stands out is that for physical the pokemon is either a Fighting-type or a bird (or both) and for special is slow and tanky (and coincidentally has Ice Beam) - and that they are among the least developed pokemon Ash actually has (especially Primeape and Lapras, but we all know Swellow, Staraptor and Hawlucha got little to no character development and Goodra clearly got rushed like hell). Meanwhile Farfetch'd is a work in progress but even then it's already clearly getting shafted along with Gengar.