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Is it possible to add a second rival in the game,similar to later generations?
Was thinking to modify an existing trainer class and just edit him to act like a rival.Would that work?
Sure. Pretty much the only thing that separates the rival from ordinary trainers is all the map scripts where the rival appears.
These scripts do important tasks like; check event flags, set event flags, check when the player walks onto pre-defined map coordinates, move the rival npc around on the screen, manually initiate battles against the rival parties.
There's no reason you can't make similar scripts with new event flags, npcs, and trainer parties.
Thanks for the answer!
If you think about it, Yellow's addition of Jessie and James acts basically as a second rival. There's no functional difference between them, just different story/context.