On his journey to become a Pokemon Master, Ash Ketchum from Pallet Town has traveled a long way, exploring many different regions across the globe and capturing numerous powerful Pokemon along the way. Ash has always had the ability to unleash the potential of his loyal companions.
Together, he and his Pokemon have journeyed through various lands, facing countless challenges and battling numerous trainers and Pokemon to become a Pokemon Master.
Finally, Ash’s dream of becoming the best trainer came to fruition when he ranked first in the World Championship, defeating the strongest trainers from all regions. Now that his journey has concluded, it’s fascinating to reflect on all of Ash’s strongest Pokemon and identify his most formidable companions.
Since beginning his journey in 1999, Ash has captured 59 Pokemon (though not all were caught), yet he tends to focus on a select few of his Pokemon. The statistics demonstrate multiple times that he doesn’t need to catch them all, as they perform exceptionally well in battles.

Below is the ranking of Ash Ketchum’s 35 strongest Pokemon:
35. Naganadel – Battle Win Rate: 50% (1/2)
34. Talonflame – Battle Win Rate: 50% (9/18)
33. Gible – Battle Win Rate: 50% (2/4)
32. Glalie – Battle Win Rate: 50% (3/6)
31. Quilava – Battle Win Rate: 50% (9/18)
30. Dragonite – Battle Win Rate: 50% (4/8)
29. Gengar – Battle Win Rate: 54% (7/14)
28. Hawlucha – Battle Win Rate: 53% (17/9)
27. Staraptor – Battle Win Rate: 55% (20/11)
26. Sceptile – Battle Win Rate: 55% (16/30)
25. Dracovish – Battle Win Rate: 56% (5/9)
24. Bayleef – Battle Win Rate: 56% (6/11)
23. Palpitoad – Battle Win Rate: 58% (3/5)
22. Pignite – Battle Win Rate: 58% (13/24)
21. Squirtle – Battle Win Rate: 58% (7/12)
20. Corphish – Battle Win Rate: 59% (16/29)
19. Noctowl – Battle Win Rate: 60% (3/5)
18. Melmetal – Battle Win Rate: 60% (3/5)
17. Scraggy – Battle Win Rate: 61% (4/6)
16. Swelling – Battle Win Rate: 63% (14/23)
15. Lycanroc – Battle Win Rate: 64% (7/11)
14. Incineroar – Battle Win Rate: 67% (6/9)
13. Rowlet – Battle Win Rate: 67% (8/12)
12. Lucario – Battle Win Rate: 70% (13/20)
11. Kingler – Battle Win Rate: 71% (5/7)
10. Bulbasaur – Battle Win Rate: 71% (21/31)

9. Charizard – Battle Win Rate: 72% (33/47)

8. Infernape – Battle Win Rate: 73% (17/24)

7. Aipom – Battle Win Rate: 75% (9/12)

6. Snorlax – Battle Win Rate: 79% (11/14)

5. Krookodile – Battle Win Rate: 80% (4/5)

4. Greninja – Battle Win Rate: 87% (47/55)

3. Goodra – Battle Win Rate: 88% (14/16)

2. Pikachu – Battle Win Rate: 89% (479/538)

1. Primeape – Battle Win Rate: 100% (3/3)

Thus, from a statistical perspective, Primeape stands out as Ash’s strongest Pokemon, as it has never lost a battle, despite only having participated in three battles before Ash relinquished it to Anthony for further training.