10 strongest Ash'so Pokémon
10 Goodra
9 Krobodily
8 Staraptor
7 Snorlax
6 Gliscor or Snorlax
5 Charizard
4 Pikachu
3 Sceptile
2 Greninja (he can be 1) Infernape without Blaze
1 Infernape with special Blaze.
LOOOOLLLL. Where are Glalie (Who was the MVP of the Hoenn league, defeating a Charizard) and Talonflame (The ace of the Kalos run) at.
Its factually proven that Goodra is one of his weakest actually.
Greninja without its power-up form is mediocre at best (Both Talonflame and Hawlucha have better feats than base Greninja, since its only real feat is against Ramos). Its kinda funny Talonflame and Hawlucha feats get downplayed because of Ash-Greninja, while they are factually better than base Greninja.
Pikachu on 4, while it has solo'd a legendary and defeating a Mega and Charizard on 5, who has solo'd a legendary as well.
Your list is totally wrong
10. Donphan
9. Tauros (Has been going toe-to-toe with Drakes Dragonite and had a draw with Annabels Metagross, which are 2 psuedo's, defeated the strongest Tauros in Hoenn and defeated Drakes Venusaur, his second strongest mon)
8. Krookodile/Glalie
7. Krookodile/Glalie (Based on true feats, Glalie gets the edge)
6. Talonflame (Went toe-to-toe with Moltres for a moment, tanked a Fire Blast from a Talonflame while being a Fletchling, brought a hit in against a Mega while being a Fletchinder, had its first win in a gym as a Fletchling (Which his other birds didn't achieve before evolving), didn't go down in a gym without taking at least another mon with him (Except for one) and didn't go down in the league without taking another mon with him.
5. Sceptile
4. Snorlax (Solo'd Greta and her fighting types)
3. Infernape (Blaze)
2. Charizard
1. Pikachu
While i placed Infernape at number 3 with Blaze, i think Snorlax is actually on number 3 when Infernape hasn't activated Blaze.
Despite Sceptile defeating Darkrai, he didn't solo it (It required 3 other mons before Sceptile to tire out Darkrai). Sceptile was pretty much outclassed by Swellow and Glalie in Hoenn as well. As such, it doesn't warrant a place any other than 5th.
Obviously, Pikachu and Charizard always have to be placed in the top 2 on sheer feats alone (With Pikachu on number 1 because it has the better feats)
As you also have noticed, i haven't take into account win/loss ratio (Since i think win/loss ratio is bs when the match isn't a direct 1v1 and the example i always use is Leavanny against Sawk, since while Krookodile delivered the final blow, he couldn't have done so without Leavanny, so i give that win to both Leavanny and Krookodile, while Win/loss ratio only takes the finisher into account).