Big thanks to Gifvex, he did most of the work on this.

Version: Red
TID: 0x7928 (31016) (third time's the charm)
Player name: AAAAAAA (7 characters)
Rival Name: AAAs-hR (AAA can be any 3 characters as long as the first one isn't a click item/too laggy)
(Something like JJj probably best, J isn't a click item and can buffer the down input)

Manip 1024 squirtle (https://pastebin.com/PJQATTqK)
Nickname it A
Standard rival fight, but switch tackle and tail whip
Pick up Antidote
Standard Weedle fight
Center

Shopping:
2 balls
2 ropes
(1 antidote if you used the other one)
1 potion

BTW to Cerulean cave

Ditto+Kadabra manip:  https://youtu.be/iN9NaNVi83M
Swap ditto to slot 1
Swap kadabra to slot 3
Get cooltrainer
rope out

BTW again, enter nearby house
step right
flash ditto
swap kadabra to slot 1
2 --> 4
flash ditto
toss slot 3
1 --> 3
flash ditto
3 --> 2
toss slot 2
1 --> 2
1 --> 2
underflow
toss slot 2 twice
QMP --> CANCEL
toss 1 from options
candy kadabra
brightness balls --> connection max potion
toss 3 from JOHN
ice heal x45 --> warping

step down

masterball x45 --> TM27 stack in rival name
Brightness balls --> pokedex
toss 7 balls
Walk 1 up, 1 right, face down
teach dig
tm28 --> tileset potions
tm28 --> connection j.
battle gio (psychic x5)

walk 1 up 1 right
battle Blaine (psychic x3, dig)

Toss slot 2 5 times
Slot 1 --> CANCEL in rival name
PCA in rival name --> Money (Pokedex or full restore)
Top QMP --> connection j item

walk 4 right, 3 up, 6 down, 1 right
battle sabrina (dig, dig, psychic, dig)
walk 1 down, 1 right, 1 down, 1 left, 3 down, 1 right, down to fuschia

walk to gym

CANCEL to koga
fight koga (psybeam x4)

Money item --> HM04
same balls --> brightness balls
same balls --> connection j
Toss 22 from TM50
Walk up
TM50 --> connection j
connection j --> tileset
toss 4 from warping
Fight Erika
Step 1 right, 1 left, 4 up, turn right
Fight Surge
Walk down 11, right 2, down 4, left 2, down to cerulean

Enter the gym
Do the weird Misty while JACKing thing

Step right 1, up 1
TID balls --> Town map
[]m[] --> North Connection
Toss 18 from []m[]
Walk up 3
j. --> TM47 x[]8
potion --> candies
ultra ball --> HM05
Walk right 4, face down
Fight Brock

Walk up to HoF

Todo:
Minor optimisations
Maybe a route 1 --> Bug Catcher manip, don't think one exists for 7 char player name + squirtle