>>36630199emerald is probably easier than ruby and sapphire since it memes you into double battles more often and champion is water specialist instead of having a lot of steel and rock types.
i am still not sure how to deal with wattson's magneton, though. there are no fire or ground types i can catch and i can't even manipulate assist since move deleter is at lilycove city.
i think electrike can learn flamethrower but the only way to get it is to grind in game corner