name rival "MN_", with _ being a space

win/lose rival (winning is safer)
if you win kill a pidgey (or rattata/metapod) before caterpie trainer
pick up 2-3 potions

heal in pewter
buy 2 escape ropes, 10 pokeballs

walk back into forest
(recommend saving before this step) trainerfly off the yellow-only trainer
http://i.imgur.com/RhF6dot.png

walk to pewter gym, have the scrub trainer see you from a distance
^ so don't talk to him or walk 1 square infront of him

growl the diglett 6 times

once you die read the sign outside the pokecenter and walk back into forest
gengar appears, thundershock it once and throw balls

once caught trainerfly off the guy again mentioned earlier
fight the scrub trainer the same way since you won't be able to talk to brock
bop brock
buy 1 item you dont have from pewter mart (escape rope closest to top)

bop route 3
bop mt moon
bop misty's scrub trainer

bop misty's staryu
switch in pikachu and let it die
bop misty's starmie

walk to cerulean center
deposit gengar (so you only have your dead pikachu on you)
walk 1 step, game will realize you have no living mons and warp you to pewter center

open menu, swap potions to slot 6

walk back into forest
missingno appears, be patient while it loads battle, you have not crashed
stall a turn with tail whip so you take damage
use a first potion, take damage
use a second potion (you will have _7 left)
catch it (first ball auto catches)

wait until you see your character's sprite appear on left
(~7 seconds, better late than crashing, no window you have to hit)
press up to get into gatehouse

walk to top door (to route 3) in the gatehouse
dry underflow with potions stack and warp to hall of fame (see blue nsc)