Skip PC potion, or make sure you have used it by pewter shopping

mart 1
2-6 balls
1 para heal


mart 2
burn heal
2 escape ropes
potion 

get abra
t-fly
switch to bulbasaur
die
encounter missingno
see http://pastebin.com/JMi3hBmb for specifics of missingno fight
growl or whatever, use some potions
catch missingno in red bar
enter guardhouse

underflow menu:
toss top item unless you caught missingno in last pokeball
swap burn heal with potion stack, toss burn heal
toss top item 4 times
toss 253 potions
swap escape ropes with TID balls
swap TM27 with master balls in warping
walk 1 up

swap moon stones with top boulderbadge, toss 4
Swap other boulderbadge with escape ropes
walk 1 left, catch mewtwo
Toss top item 7 times
swap top potions with top cancel
swap j in rival name with earthbadge
swap moon stone x13 with full restore
swap 3f with hm04, toss 19

Rest of route should be the same.