Pikachu = Pikachu
Gliscor > Mr. Big and Reliable
Torterra >/= Barney
Staraptor < Smogonbird
Blazefernape = IKUZEfrog
Buizel =/< Lucha
Pikachu = Pikachu
Glalie > Mr. Big and Reliable
Swellow > Smogonbird
Corphish =/< Lucha
Torkoal =/< Barney
Sceptile = IKUZEfrog
Alright let's do this
1. Ash Greninja > Blaze Infernape > Sceptile > Infernape = Greninja
2. Swellow > Talonflame > Staraptor
3. Hawlucha > Buizel = Corphish
4. Goodra >= Torterra > Torkoal
5. Glalie > Gliscor > Noivern
Ash-Greninja is Ash's strongest regional ace bar none for 1 simple reason, It forced Diatnha to use ME. While it was apparent that Diantha was not fighting base Greninja seriously and just wanted to test its power, but as soon as it transformed (Imperfect), we see a clear shift in Diantha's tone and she herself implies that AG > base Gardevoir. Diantha doesn't use ME unless she thinks it's necessary with Pikachu's battle being a prime example. There is no evidence that implies Diantha's base Gardevoir is significantly weaker than the base versions of any other regional champion's ace. AG also had a very competitive match with an E4+ lvl Pokemon in Alan's MC X, whereas Infernape got OHKed by Flint's Infernape and while its blaze is very formidable, saying it would give Flint's Infernape a competitive fight is a big stretch. In addition, The above champion statement could also be made about the E4. Sceptile is very impressive with its most notable win being against a Darkrai at about 70% health (yes, even with dream eater healing taken into consideration) give or take 10%, but do you really see it forcing an E4 or Champion lvl Pokemon to ME, because that still seems like a stretch to me. It is harder to say though since Sceptile has never fought an E4 or Champion (though Grovyle did and got destroyed by Drake's Altaria).
Regarding Hawlucha, it fainted to a move that essentially hit him with his strongest move (Flying Press) at x4 power (since it was SE on Slaking). Sawyer stating that Slaking was Hawlucha's counter heavily implies it was trained in bulk to be able to withstand an onslaught of attacks. Hawlucha had a great showing against Alan and lost due to a combination of thunder wave paralysis + staggering from the damage of missing HJK + a OHK move. Bisharp was also portrayed as 1 of Alan's stronger Pokemon, so I see no shame in that loss either. Like it or not, the narrative of showcasing Hawlucha beat Astrid's Mega Absol was done to symbolize Hawlucha's strength. I do wish we saw the full battle between them, but even if Ash's other Pokemon had dealt prior damage to Mega Absol, being able to actually KO a very strong Pokemon is still a commendable feat. A good example of this being Gliscor's KO of Paul's Drapion still being impressive despite Drapion being significantly damaged and fatigued from taking out half of Ash's team prior. Mega Absol clearly was very strong, since even Alan acknowledged its strength (though Alan's MC X wasn't quite E4 lvl at that time, but was still good enough to impress 1). Nothing against Buizel and Corphish, since both have had impressive battles, but they're still below Hawlucha.
Regarding Goodra and Torterra. Torterra's most impressive GYM win was against Roark's Ramparados as a Turtwig and Goodra's was Clemont's Luxray. Now this is a matter of opinion, but I would say that Clemont's Luxray is stronger. Also you can't use the evolution argument, since It could be said that Turtwig got overall worse once it evolved, since it lost a lot of its speed. They both were able to significantly damage powerful Pokemon in the form of Drapion and Bisharp. Goodra's battle with Slurpuff had a lot of symbolism of Goodra's mental fortitude, since that battle showed Goodra could go toe to toe with a type that it once feared and that it could keep charging bide while staring flamethrower in the face (the fire would relate to Goodra's PTSD), so I'm not holding that tie against it. I would say they're around even with a slight edge to Goodra, since atleast it could knockout Pokemon in its final stage, though I wish we saw it in more battles to make better comparisons. Torkoal was really impressive against Brandon's Registeel, but given how consistently poor its battling performance is barring that, that I'd say it's easily Ash's weakest tank when compared to Torterra and Goodra.