Ash's Pignite shared the simular back story just like his Charizard and Infernape as they both were abandon by their selfish former trainer before later join Ash's team while later in the series they evolved except unlike Charizard and Infernape as they evolved twice while Pignite only evolved once.

I still wished that Ash's Pignite had evolved into Emboar before Pokemon: Black and White Series came to an end because Emboar really suit Ash's team and would if Pignite had evolved into Emboar in the first place then it would be amusing to see him and Charizard using their flamethrower on him.

I would like to see Ash's Snivy's backstory more of why she left her previous trainer in the first place or even better battle her previous trainer and evolved into Servine just Ash's Pignite did.

Game freak love giving ash tramtized fire starters

^ I know like why give him second hand starters?

To set him apart as a trainer from the rest of them like the clown to get rid of tepig