Top 6 strongest pokemon owned by Ash

Ash having a very long journey of his pokemon adventures. he start his journey from kalos region, then followed with, jhohto, sinnoh, hoenn now recently finished his journey at kalos region. where he encountered with various pokemons. and he ows some pokemon of them. And he travels with them. Over the 21 years of Pokemon Ash has caught many kinds of Pokemon. Some have been strong, some have been okay. But today I will be counting down the top 6 strongest Pokemon he owns! These Pokemon have all came in clutch for ash whenever he has needed them and they are pretty strong. What Pokemon of Ash's do you guys find strong though? Share them in the comments below!