You'd need 5900 coins total, minus 2200= 3700 Coins, which equals: 7Pokedollars. Now, if you haven't challenged the gym at all, do so, that'll get you enough money. There are a lot of trainers, three of which are Beauties, which pay like 1,700 something, plus Erika, which gives 2,000 something. All together, if you fight every trainer, win every time, beat Erika, without losing money by losing, you'll have 9870=50x9= 450 coins, plus 870 extra
Total left: 3250
If by under the Game Center, you mean the Rocket Hideout, then battling everyone in there will give 'ya: 10196+870=11066(assuming you've already beaten the Grunt in the actual Game Corner, if not, then add 640 Pokedollars to the sum of leftover money.)=550
Total Left: 2700
Tower Money: 12836=600 coins and 902 money leftover
Total Left: 2100 Coins
That's all the trainers, now if you sell all the items in those places, not including stuff like TMs, and stuff you can't find again, because your gonna want those, then: 33015 Pokedollars = 1650 Coins, plus 917 money left over.
Total Left: 450 Coins
From there, just get a bit more money through selling stuff and playing through the game, and you'll be good.
Source: Bulbapiedia Bulbagarden pages on Team Rocket Hideout, and Pokemon Tower, as well as the Celadon City Game Corner Bulbapiedia Page and
https://serebii.net/itemdex.shtml(I just entered in the item to find it's sell price), https://serebii.net/pokearth/kanto/3rd/celadoncity.shtml
https://serebii.net/pokearth/kanto/3rd/pokemontower.shtml
https://serebii.net/pokearth/kanto/3rd/rockethideout.shtml
