OPTION A: Buy 1680 coins after Rocket Hideout
OPTION B: Buy 1680 coins before Rocket Hideout; pick up 3 items to sell

Money calcs:
5102	starting
5000	nugget
640		early rocket
2800	don't buy supers
1500	sell TM39
1500	sell TM03
1000	sell TM28
1500	sell TM45
1500	sell TM09
1000	sell Max Ether
-1248	right side erika gym

Time loss:
- extra sell menu: +2.8
- risk of no supers: +1.8
- sell nugget: +1.6
- early rocket: +1.6
	- get TM45: +3.2
	- sell TM45: +2.0
	- get TM09: +4.9
	- sell TM09: +2.0
	- get max ether: +3.6
	- sell max ether: +2.0
TOTAL: +7.8 OR +25.5

Time save (money):
- 1000 from supers (estimate)
- 4000 from TMs/Max Ether
- -1248 from right side erika's gym
TOTAL: -$248 (about +0.5 seconds) OR $3752 (about -7.6 seconds)

Time save (early Charcoal)
- movement: -10.3 OR -19.9
- wartortle: -0.8
- marowak: -1.8
TOTAL: -12.9 OR -22.5

NET: -4.6 either way
However, Option A doesn't force you to commit to this strat until Cerulean Mart (at which point you've already committed to your exp. route), so it is better.