Dying doesn't matter.
Raiden is immortal... he cannot be killed.
But that doesn't help him much if hes trapped in TK bubble, which Mew-Two can easily conjure, than hurl him into the sun. Raiden may not die, but he will be out of the fight.
THe rules here state that you don't have to kill someone to "win" a fight, you just have to make them unable to fight back.
I mean you have gods capible of destroying planets just by fighting on them (rayden mk I)
cybernetic ninja units capible of self destructing and blowing up the entire world (cybernetic ninjas mk III, ultimate, and trilogy)
half dragon men who dwarf rayden in strength (goro, blood and thunder)
and are durable enough to take everything rayden has before being vaporized (kintaro mk II)
sorcerors who can am their strength to god like levels (quan chi and shang stung deadly alliance)
sorcerors who outclass them by leagues (shao kahn) who have also vaporized rayden with a thought...
fighters who can't be killed and instead just become stronger, (scorepion)
fighters capible of deating entire armies single handedly (sub zero deception)
well, mortal kombat is sick... but what will they do against ditto or mew?? they can transform till theyre strongest warriors. or mewtwo, who easily defeats guys as liu kang. and then rayquaza, thats a destructive force, able to massdestroy 4 warriors in one attack, or something... and rhydons skin cannot be hurt by giant drill and he can send trucks flying 20 meter away with a simple stretched punch. there are other pokemon than bulbasaur and pikachu, shin remy.
what will a guy like liu kang do against a rhydon?? what will liu kang AND johhny cage do to such a pokemon?? liu kang, johnny cage AND sonya blade wouldt could hurt it. a giant drill cant. it is stated in the pokedex. and its punches can send trucks flying 20 meters away. and rayquaza is a masskiller. some hyperbeams kill many of them. and when the normal warriors from mortal kombat is dead, and the small weak pokemons like pigey and rattata are killed, its all the strong pokémon who the normal people from mk didnt killed, vs, Rayden, Scorpion, and the other deadlies. Mew and Ditto transforms to the strongest fighter from mortal kombat and becomes immortal. then pidgeotto uses sandstorm to blind the other and they get their ass kicked by their own shapes! or mewtwo tosses them up in the sun. he is extremely psychic. and the rules say that it doesnt matter if they die, they should only be inable to fight