Ash may not have caught 'em all, but you'd be surprised at the number of Pokemon he does own. This list has all of the Pokemon partners he currently owns.
The Evolution of Ash Ketchum's Teams Through Eight Generations of Pokémon
UPDATED: My version of Ash and his companion's Pokemon teams from Gen 1-8 (including a hypothetical Gen 9 Ash Team.) Thoughts? : r/pokemonanime
Ash Ketchum - Bulbapedia, the community-driven Pokémon encyclopedia
The Strongest Pokemon Ash Ketchum Has Caught In Each Region, todos
Pokemon's Ash Ketchum Finally Became The Very Best (Like No One
OT, - Community - Hype - Hogwarts Legacy, OT, The Prisoners of
The Pokemon Group! - Old Regions: Alola Pokemon Showing 1-1 of 1
Pokemon fans say 'childhood over' as Ash Ketchum and Pikachu leave series
Pokémon: Every Pokémon Ash Caught In Kanto, Ranked, todos os
Todos os Pokémon do Ash - Pokémothim, pokemons eletricos de hoenn
All of Ash's Pokémon, Listed Every Pokémon Ash Owns, Listed
Anime: Equipes de Ash – Pokémon Mythology, todos os pokémons do ash
Todos os Pokémon do Ash - Pokémothim, pokemons eletricos de hoenn
The Evolution of Ash Ketchum's Teams Through Eight Generations of Pokémon