(Do not get Ether before Bill. Get all 5 Elixirs, and Max Elixir)
Sell: TM34, Nugget
Buy: 3 Poke Ball, 7 Potion | 15 X Acc, 4 X Spd, 1 X Spec, 9 Super Repels, 2 Super Potion [11 left]

Lavendar Rival: TB, TB, BB, Thrash x3
Tower Rocket: Thrash (Could X Spec: TB, Thrash since have the money)
[Have 18 items after Poke Flute. Do not take the centre]
(Drill over Thrash and PP Up it on way to Safari, Fly back to Fuschia)
X Acc, HD, HD, HD, HD                 
X Acc: HD, HD              
(Elixir)                 
Koga: X Acc: HD, HD, HD, Hit by Self-D for redbar/HD
(Elixir 2, Surf, Candies to 38) [19 items]
Arbok: TB + TB (~95.6% to 2HKO)
Silph Rival: X Acc: HD, HD, RS, HD, HD           
Rocket: X Acc: BB, HD, HD   
(Elixir 3, can be used on Nidorino)              
Giovanni: X Acc: HD, HD, BB, HD        
(Strength, Blizzard over Bubblebeam, Both Candies to 43)
Blizz | Erika: Blizz, Blizz, Blizz    
Blaine: X Acc: RS, HD, HD, HD          
(Fly to Saffron, Elixir 4)                           
Sabrina: RS, X Acc: HD, RS, HD            
Blizz | X Acc: HD, Blizz, HD                                                  
Giovanni: X Acc: Blizz, Blizz, HD, HD, (Elixir 5), HD      [Using last Elixir opens space for Fissure) 
Viridian Rival: X Acc X Speed: Blizz (Blizz), Blizz, TB, RS, HD, HD
(Fissure over Rock Slide)          
Lorelei: (Switch) X Acc (#2, D1) Fiss, Fiss, Fiss, Fiss, Fiss            
Bruno: X Acc (#2, D1) Blizz, HD, HD, Blizz, HD                           
(Max Elixir)
Agatha: X Spd (#3) X Acc: Fiss, HD, Fiss, Fiss, Fiss                       
Lance: X Spec (#9/4) TB, Blizz, X Spd (#3, D2/U1): Blizz, TB, Blizz 
Champion: X Acc (#2, D1) X Spd (#2, D1) HD, HD, Fiss, HD, HD, HD

Alt: Pickup X Spec in underground instead of buying one (~0.8 sec slower)
As a result have extra money, but doesn't seem useful, as it doesn't get you enough for a Super Repel.

Note:
If killed by Koga's Weezing by mistake (Crit or high roll, as if he uses X Att you should just HD), then take the centre in Celadon when you fly back (Cost 15.8 - 9.8 - 0.8 = 5.2). Try to get redbar elsewhere, use your candies after Giovanni. Still outspeed Alakazam, but Arbok is a bad range.