Pokemon riddle of the Sphinx 5th question ( free Art request)

http://dragonfire53511.deviantart.com/

Hello to all, my fellow members;

I always find myself drawing Pokémon so I decide sense become a of Lake valor. I do a little thing with my free time where I post a Pokémon question.

An first one to answer will receive a digital Pokémon picture from me 400 x 600 of a single Pokémon.

Fifth Question:
Which of Ash Pokémon had the most troubling events involving it relationship with Ash ?

Hints -

Spoiler

it's left Ash team and return multiple time and current with professor oak

If you use hint please name the events - this is just a honor thing​

 

Correct; So Which Pokémon would you like me to draw for you ?

 

I am glad you like it