The "Gangsta" Jessie is from Viridian.
And J being hired by Galactic is possible, but I think J kinda likes ash though.
Usually when Ash and co meet someone, they forget the person until they meet each other again. But, Ash actually mentioned J...which could be the start of something new..err...nevermind..
I could see, during the " Evil Team's Last Stand" Episode(s), as in the GrouGre Battle in Hoenn, J could doublecross Galactic( if she joins) or just help Ash and co defeat Galactic...
Provided The Writers capture Galactic's Bad ***'ness properly!
~Back After a Long Break~
~Full Time Halo 3~