Shiny diglett and golbat lucky for 20k - maybe 15k at best for diglett. As for aipom, I don't see very many on the market - unless it's a shiny voltorb situation where they pop out from everywhere once you put one up.
As for your scizor, it definitely depends here on the buyer. Some people go crazy for these if it's fully EV trained, the right nature and the hidden abilities - technician, I think? So because it's a scizor, if kanto, you could be looking anywhere between 75-250k, imho. Nothing I'd certainly pay for, though. Bellsprout, nothing really. Charizard, because he's the final evo of a starter that's already given a slight value - but still quite common being many first choices. If he's set up the same as-if Scizor is, 80-150k tops.
Good luck selling and buying in this economy, too. People wanting to overprice by 1M and buy everything for 1K. Quite sad.