The only other time I've died repeatedly for grinding purposes was when grinding for gold nuggets on nugget bridge north of Cerulean City in Pokemon red and blue.
okay, so I got bored and resorted to spelling words with the map. around the second letter, I found what I assume is the boss... but I cannot beat it simply for the fact that my lasers just kind of bug out and slowly burn out. wat?
 "Demons Took My Daughter"){kind=icon}
 "Reactance 2"){kind=icon}
 "Bubble Tanks 3"){kind=icon}
 "Portal: The Flash Version"){kind=icon}
 "Big Head Bash"){kind=icon}